ATOMIC AND MOLECULAR PHYSICS
Experimental Physics of Atomic Collisions
PUBLICATIONS
in 1995 – 2000
Papers
and Letters (Refereed)
“The formation of vibrationally excited hydrogen
molecules on carbon surfaces”
S. Gough,
C. Schermann, F. Pichou, M. Landau,
Astron. Astrophys. 305 (1996) 687 – 93
A novel technique for the measurement of the excitation of molecular hydrogen formed on surfaces has been applied to the study of H2 formation on carbon. The results show that on certain carbon surfaces H2 may form in vibrational levels as high as v = 7, and that at a surface temperature of 90 K between 2.6 and 7 % of the molecules can be found in the v = 1 level. This supports the proposal that a significant contribution on the population of vibrationally excited hydrogen in the interstellar medium comes from the formation of molecular hydrogen on carbonaceous interstellar grains.
“A
measurement of the two – photon ionization of atomic hydrogen H (2s) near the
resonance with the 3p state”
P.
Antoine, N. Essarroukh, J. Jureta, X. Urbain and F. Brouillard
J. Phys. B: At. Mol. Opt. Phys. 29 (1996)
5367 – 76
We describe a new experiment dealing with the multiphoton ionization of metastable atomic hydrogen H (2s). The ion yield has been measured in a relative way but it provides absolute photoionization rates. In the present contribution, the wavelength is tuned in the vicinity of the 2s – 3p transition and the laser intensity is in the 107 – 5 x 1010 W cm-2 range. Experimental photoionization rates and resonance width are found to be in agreement with theoretical predictions.
“An electrostatic lens for zero – degree electron
spectroscopy”
L.
Vikor, L. Sarkadi, K. Tokesi, D. Varga, F. Penent and J. Palinkas
Nuclear Instruments and
Methods in Physics Research B 114
(1996) 164 – 70
A multi – element electrostatic lens was constructed to improve the energy analysis of electrons ejected at zero degree in ion – atom collisions. The lens, coupled to a cylindrical mirror analyser, considerably extends the energy range of the analyser to lower energies by acceleration of the electrons, and improves its angular resolution by angular magnification. The distribution of the potential in the lens was determined using series expansion, starting from a given function of potential at the lens axes. The electron – optical properties of the lens were obtained from ray tracing. The power of the lens is demonstrated taking the spectrum of electrons emitted from He- on Ar collisions at 112 keV impact energy, in which the auto – ionization peaks originating from the (1s2p2p’) 4Pe shape resonance of He- are completely resolved.
“Ion – electron coincidence extensions for an
electrostatic electron spectrometer”
Gy. Vikor, S. Ricz, A. Kover, B. Sulik, L. Toth,
Nuclear Instruments and
Methods in Physics Research A 381
(1996) 86 – 90
The design of a recoil ion and a scattered projectile detector is presented. The devices are used to measure the recoil and projectile ions in coincidence with the electrons ejected from atomic collisions measured by a high resolution triple pass electrostatic electron spectrometer (ESA – 21).
“Strong
projectile – energy dependence of the Auger – line intensity at 0° due to Coulomb focusing in fast proton –
neon collisions”
Gy.
Vikor, S. Ricz, B. Sulik, L. Toth, A. Kover and J. Vegh
J. Phys. B: At. Mol. Opt. Phys. 29
(1996) L787 – 93
The variation of the intensity of the Ne K-L2,3L2,3 (1D2). Auger line due to post-collision interaction has been measured as a function of the projectile energy at 0° (±1.4°) observation angle in 0.8-3.2 MeV H+-Ne collisions. The measured Auger – electron yield normalized to the theoretical or experimental total K - shell ionization cross section shows a strong enhancement when the projectile velocity is smaller than the Auger – electron velocity. The general agreement between the present experimental data and continuum distorted wave calculations provides a clear evidence that the observed impact – energy dependence is mostly due to the post – collision Coulomb focusing exerted by the projectile on the Auger – electron.
“Single and double – electron detachment from H-
in collisions with He”
L.
Vikor, L. Sarkadi, F. Penent, A. Bader and J. Palinkas
Phys. Rev. A 54 (1996) 2161 – 8
The single and
double – electron detachment processes have been studied for 85 keV H-
on He collisions measuring the energy spectra of the electrons emitted in
forward direction. In the spectrum belonging to the single – electron loss
(SEL) the nonresonant part (cusp) has been resolved from the resonant part
[lines from the (2s2p) 1P0 shape resonance of H-
]. The ratio of the integrated yield of the double – electron
loss (
“Multiple absorption and relaxation processes in SF6
– CH4 mixtures: an experimental study”
J.
Jovanović – Kurepa,
Chemical Physics 211 (1996) 347 – 58
The effects of collisions with nonabsorbing partner molecules (CH4) were investigated in absorption processes in SF6 irradiated by a pulsed CO2 laser. An experimental apparatus was developed for simultaneous absorption measurements both by transmission and photoacoustic spectroscopy. Enhanced absorption cross sections of SF6 in collisions with nonabsorbing CH4 molecules were measured, together with the average number of absorbed photons per molecule. The differential absorption cross section were also determined for the fluence range of 0.1- 0.7 J/cm2, and the CH4 pressure range of 1 – 140 mbar. The results obtained were analyzed based on the predictions of the generalized two-level model proposed for multiple photon processes. An estimate of the role that rotational-rotational and vibrational-translational relaxation processes play, in inducing the effect of enhanced absorption in SF6 – CH4 mixtures irradiated by pulsed CO2 laser radiation, is given.
“Linear pulsed photoacoustic
spectroscopy: Calibration method”
M. Terzić, D. Markušev and
J. Jovanović –
Kurepa
Review
of Research, Faculty of Sciences-University of
The influence of the gas
pressure and the gas species on the
sensitivity of PA microphone-cell configuration in the linear absorption regime
is described. The test of the Pa apparatus was performed using a calibrated
variable concentration of ethene and carbon - dioxide both diluted with
synthetic air. All measurements were done in the pulsed regime and in the mid
infrared region for the 100 mJ input laser energy. The results show that the
sensitivity for both investigated gases depends on gas concentration as well as
gas species. The pressure dependence in the whole investigated pressure region
cannot be described with the same function for both investigated gases.
“Methanol molecule fragmentation by electron impact”
Gy.
Vikor and M. V. Kurepa
J. Serb. Chem. Soc.61 (1996) 437 – 45
Methanol molecule fragmentation, by measuring partial ionization cross sections, was studied in the incident electron energy range from threshold to 200 eV. The experimentally obtained relative ion currents for the most abundant ionic species were normalized to the recent electron impact total ionization cross sections of Djuric et al. via the mass spectrometry ion abundance determinations of Wange et al.
“Electron collision experiments on excited atoms”
B. Marinković, Z. D. Pešić, R.
Panajotović and D. M. Filipović
in The World of Quanta, Ed. R.
Antanasijević, Institute of Physics, Belgrade, October 1996, pp. 29 – 37
(in Serbian)
The
importance of the study of electron collisions by atomic species is stressed.
The brief overview of activities at the
“Critical minima in elastic electron scattering by
argon”
R. Panajotović, D. M. Filipović, B.
Marinković, V. Pejčev, M. Kurepa and L. Vušković
J. Phys. B: At. Mol. Opt. Phys. 30 (1997) 5877 – 94
We determined experimentally two critical points in elastic electron scattering by argon were the differential cross section (DCS) attains its smallest values. The points were found to be at 68.5° ± 0.3°, 41.30° ± 0.02 eV and at 143.5° ± 0.3°, 37.30 ± 0.02 eV. Special attention was given to improve the angular resolution in order to determine the exact positions of the minima. These minima are important because they are a sensitive test of the validity of experimental procedures and are used to verify theoretical predictions of DCS shapes and magnitudes and of the polarization of scattered electrons. Normalized DCS were determined by measuring the angular distribution of elastically scattered electrons at incident energies of 10, 15, 20, 25, 30, 40, 50, 60, 75, 80, 90, and 100 eV in the angular range 200 - 1500. Results are compared with the available experimental and theoretical data. In addition, integral, momentum-transfer and viscosity cross sections were determined by numerical integration of the measured DCS extrapolated to 0° and to 180°.
“Triple Differential Cross Section Measurements for
Double Photoionization of D2”
T.
J. Reddish, J. P. Wightman, M. A. MacDonald and S. Cvejanović
Phys. Rev. Lett. 79
(1997) 2438 – 41
Angular distributions of the two ejected electrons following photodouble ionization of molecular deuterium have been measured using a toroidal photoelectron – photoelectron coincidence spectrometer in conjunction with synchrotron radiation. Six (g, 2e) triple differential cross sections (TDCS) were measured in the plane orthogonal to the photon beam direction with E1 = E2 = 10 eV. The angular distributions are similar to those of helium, but with differences which we highlight by comparing the D2 TDCS with helium TDCS measured under nearly identical conditions.
“Dual
toroidal photoelectron spectrometer for investigating photodouble ionization in
atoms and molecules”
T. J. Reddish, G. Richmond, G. W. Bagley, J. P.
Wightman and S. Cvejanović
Rev. Sci. Instrum. 68
(1997) 2685 – 92
A photoelectron – photoelectron coincidence spectrometer, incorporating two independent toroidal analyzers, has been developed to study photodouble ionization of gas targets using synchrotron radiation. The energy - resolved and angle – dispersed electron images are recorded using two – dimensional position – sensitive detectors. The design and performance of the spectrometer is described, with particular emphasis on the electron optical properties of toroidal deflectors and their associated electrostatic lenses. The operation and calibration of the spectrometer are discussed and sample (g, 2e) results of helium are presented.
“The influence of a thin gold film on vibrational
excitation of hydrogen molecules”
J. Chem. Phys. 106
(1997) 4745 – 52
The vibrational populations have been measured for hydrogen molecules issuing from a cell containing a mixture of atomic and molecular hydrogen in the presence of an incandescent tungsten filament. The cell walls were covered with a gold film by in situ evaporation. The gold film was observed to exist in two forms, the first being transformed irreversibly into the second by annealing. The observed behavior of the vibrational populations differed from those observed previously with other metals in that the relative distributions depended on the filament temperature. This behavior was interpreted as being the result of either special characteristics of the hydrogen – tungsten interaction at the filament or the presence of a potential barrier in the reaction path for the formation of hydrogen molecules by the process of recombinative desorption.
“Influence
of spontaneous decay on resonantly enhanced two – photon ionisation of D (2s)”
N.
Essarroukh, P. Antoine, P. Karangwa, J. Jureta, X. Urbain
Z. Phys. D 39 (1997) 15 – 9
The wavelength dependence of the two-photon ionisation of metastable D (2s) by a laser beam has been measured near the 2s – 3p resonant frequency. A sharp structure is observed in the broad resonance profile at quite moderate intensity. Its origin is shown to be the spontaneous decay of the 3p state that competes with photoionisation.
“Vibronic coupling and selectivity of vibrational
excitation in the negative ion resonances of ozone”
M.
Allan and D. Popović
Chem. Phys. Lett. 268 (1997) 50 – 4
A recent experimental paper reported two shape resonances in electron impact on ozone, A1 and B2 both causing vibrational excitation with a distinct pattern of selectivity. The present Letter attempts to rationalize this selectivity using approximate potential curves calculated for the A1 and B2 resonances by adding the SCF energy of neutral ozone to electron attachment energies calculated from ab initio virtual orbital energies using Koopmans’ theorem and an empirical scaling relation. The slopes of the curves explain the efficient excitation of the symmetric stretch by both resonances and the lack of the bending excitation by the B2 resonance. The A1 and B2 resonances are strongly coupled by the b2 antisymmetric stretch vibration causing a double minimum on the lower surface. Nonadiabatic effects caused by the strong vibronic coupling explain the observed excitation of the antisymmetric stretch vibration.
“How can a neutral atom capture an electron to
continuum states?”
L. Sarkadi, M. Kuzel, L. Vikor, P. A. Zavodszky, R.
Maier, D. Berenyi, K. O. Groeneveld
Nuclear Instruments and
Methods in Physics Research B 124 (1997) 335 – 41
We report on a systematic experimental study of the cusp peak associated with the ionization of the target (known as electron capture to the continuum, ECC) by impact of neutral atoms. In a measurement carried out for He0 on Ar collisions, the dependence of ECC on the impact energy was investigated. The energy was varied between 18.9 and 250 keV/amu. The relative contributions (“fractions”) of the different processes (electron capture and loss to the continuum, double electron loss) to the cusp have been determined. For the ECC channel absolute doubly differential cross sections (DDCS) were also measured and compared to the corresponding DDCS values obtained with He+ projectiles at the same experimental conditions. In another experiment an accurate measurement was performed for the shape of the ECC cusp by impact of ground – state and excited (metastable) He projectiles. The aim of this latter experiment was to check the validity of a model based on the formation of a low – lying virtual resonance state of the intermediate e- + He(21S) system. The case of the neutral hydrogen as projectile was also considered: the ECC cusp observed from 100 keV H0 on He collisions is compared with the corresponding ECC cusp obtained with protons.
“Cusp – electron production due to transfer
ionization in 25 – 250 keV/amu He2+ + Ar collisions”
L.
Vikor, L. Sarkadi, J. A. Tanis, A. Bader, P. A. Zavodszky, M. Kuzel, K. O.
Groeneveld and D. Berenyi
Nuclear Instruments and
Methods in Physics Research B 124 (1997) 342 – 6
Cusp-electron emission has been investigated in 25 – 250 keV/amu He2+ on Ar collisions. Two processes which contribute to cusp electrons for this collision system, Electron Capture to the Continuum (ECC) and Transfer Ionization (TI), were distinguished by detecting the electrons in coincidence with the charge – state analyzed outgoing He2+and He+ projectiles, respectively. The ratios of the electron yields for the TI and ECC channels were determined over the energy range investigated. These ratios can provide information on the role of the electron – electron interaction in the two – electron TI process. The measured TI/ECC ratios were compared to the measured total double- to single – bound state capture cross – section ratios. These ratios are found to be consistent with a simple relationship based on the independent particle model, indicating a lack of electron – correlation effects for cusp – electron production by TI in these collisions.
“Angular distribution of N2 KVV Auger
electrons induced by 1.5 and 2 MeV protons”
Gy. Vikor, S. Ricz, L. Toth, B. Sulik, J. Vegh, A.
Kover and L. Kover
Nuclear Instruments and
Methods in Physics Research B 124 (1997) 393 – 7
The angular distributions of the KVV Auger spectra of N2 molecules induced by 1.5 and 2 MeV proton impact have been studied at 13 different angles from 0° to 180° relative to the ion beam. Besides the transition energies, line widths (FWHM) and relative intensities, the anisotropy parameters and the anisotropy coefficients of the Auger lines have also been determined. Strong indications have been found that the K – shell ionization cross section in homonuclear molecules may depend on the orientation of the molecular axis relative to the ion – beam direction.
“Observation of electron impact inner – shell
excitation of argon by means of satellite Auger spectra”
B.
Paripas, Gy. Vikor and S. Ricz
J. Phys. B: At. Mol. Opt. Phys. 30 (1997) 403 – 12
We have studied the inner-shell excited states of argon below the 2p thresholds for electron-impact excitation in the range of the incident energy E0 = 275 – 1700 eV. We carried this out through the measurement of the electrons during the decay of the states. The corresponding satellite peaks in the spectra of the emitted electrons were separated from the normal (diagram) LMM Auger peaks by a special evaluating process. We observed the satellite peaks coming from the 2p-1 ( 2 P3/2 ) 4s ® 3p-2 ( 1D ) 4s,
2p –1 ( 2 P3/2 ) 4p ® 3p –2 ( 1D ) 4p and 2p –1 ( 2 P3/2 ) 3d ® 3p –2 ( 1D ) 4d transitions at all applied incident energies. The intensity of the satellite peaks increased approaching the ionization threshold
( E0 = 275 – 300 eV ). Nevertheless in the range E0 = 1000 – 1700 eV we could identify more satellites due to the lower continuous background and the smaller post – collision interaction effects.
“Transition
energies and relative intensities of the Ar L2,3 – MM diagram Auger
lines: a high – resolution study”
Gy. Vikor, L. Toth, S. Ricz, A. Kover, J. Vegh and
B. Sulik
Journal of Electron
Spectroscopy and Related Phenomena 83 (1997) 235 – 45
The Ar L2,3 – MM Auger spectrum induced by impact of 2.0 keV electrons was measured with high resolution (68 ± 4 meV) in the 15 - 90° angular region. Relative yields, level widths and transition energies have been determined for the diagram Auger lines originating from the 2 P1/2 and 2 P3/2 initial vacancy states. The data are compared with those of earlier experimental studies and theoretical calculations, including multiconfiguration Hartree – Fock calculations performed in this work. The isotropy of the studied lines has been confirmed. The measured relative intensities of the fine – structure components of the L 23 – MM ( 3 P 0,1,2 ) Auger triplets have been found different from those obtained in theoretical calculations and earlier experiments.
“Observation of low – lying resonance states of He-
at the 2 1S and 2 3S He thresholds”
A.
Bader, L. Sarkadi, L. Vikor, M. Kuzel, P. A. Zavodszky, T. Jalowy, K. O.
Groeneveld, P. A. Macri and R. O. Barrachina
Phys. Rev. A 55 (1997) R14 – 7
We measured the cusp electron production associated with target ionization at the impact of a
400-keV pure 2 3S He beam and a mixed beam containing all three long – lived He states, i.e., 1 1S, 2 1S, and 2 3S. Using the results of an earlier experiment [Kuzel et. al., Phys. Rev. A 48, R1745 (1993)], we estimated the cross section for both metastable states of He. We found that the cusp for the 2 1S state is much larger and sharper than for the 2 3S state. The peaks are manifestations of excitation of low-lying virtual or weakly bound states of the He- ion at the 2 1S and 2 3S thresholds.
“Absence of the cusp in the single – electron
detachment spectrum of the He- ion”
L.
Vikor and L. Sarkadi
Phys. Rev. A 55 (1997) R2519 – 22
The energy spectrum of electrons emitted in the single – electron detachment process in collisions of 200-keV He ions with He was measured. Taking advantage of the method of the 0° electron spectroscopy carried out with good angular and energy resolution, the lines from the decay of the (1s2p2p’)4pe shape resonance of He- were resolved and the absence of the characteristic cusp peak in the double – differential cross section was established.
“Electron optics: Electron beam source and
electrostatic lenses”
J. Jureta
in Free Electron Beams, Symposium Electron - The Centenary of the Discovery, Vol.3, Ed. M. Kurepa, Serbian Academy of Sciences and Arts, Belgrade, 1997, pp.59-130 (in Serbian)
The principles of electron optics are discussed in present text. In the first part a source of an electron beam is discussed, and the second is devoted to electrostatic lenses. The ways of production and formation of an electron beam, types of cathodes, various types of electron emission and various types of electron guns are described in the first part. Basic relations for understanding of the behaviour of electrons in an electron beam are discussed including the space charge effect. The emission system of the low energy electron spectrometer in the laboratory for experimental atomic physics at the Institute of physics is described. Basic principles of the electron optics, various types of electrostatic lenses are discussed in the second part of the text. The role of defining apertures in an electron optical system is discussed. Three different emission systems having different forms of the aperture in the electrostatic lenses are also discussed. Electron optical system developed for low energy electron spectrometer at the Institute of physics is described.
“Polarized electron beams”
B. Marinković and M. V. Kurepa
in Free Electron Beams, Symposium Electron - The Centenary of the Discovery, Vol.3, Ed. M. Kurepa, Serbian Academy of Sciences and Arts, Belgrade, 1997, pp.209-256 (in Serbian)
We present a review of scattering processes involving polarized electrons by atomic particles. Beside definitions of polarized electron beams and physical observations which describe polarization phenomena, basic interactions such as spin-orbit and exchange, as well as "fine structure" effects defined as interplay of these two interactions are investigated. A production of polarized beams by means of atomic physics and solid state physics techniques is reviewed. Mott polarization analyzer is described. Scattering processes of polarized electron beams by atomic particles including elastic scattering, excitation and ionization are covered. Beside the historic perspective, the newest results in the field as well as the contributions of Yugoslav authors are presented.
“The
influence of sample thickness on the determination of large optical absorption
coefficients in liquids”
M.
Terzić, J. Jovanović – Kurepa and J. Slivka
J. Phys. D: Appl. Phys. 31 (1998)
1368 – 74
The effect of the sample thickness on the measurement of optical absorption coefficients in opaque liquids has been examined in this work both experimentally and theoretically, using the method of photoacoustic spectroscopy and taking into account the decrease of the pulse amplitude ratio with increasing propagation distance. Measurements were performed in water within a narrow wavelength range for various sample thicknesses (4 mm < L < 160 mm). The results are in good agreement with data obtained by other samples of up to approximately 4 mm thickness. Furthermore, the conditions for the application of this scheme are outlined.
“New
Method for the Study of Dissociation Dynamics of State – Selected Doubly
Charged Ions: Application to CO2+”
F. Penet, R. I. Hall, R. Panajotović, J.
H. D. Eland, G. Chaplier and P. Lablanquie
Phys. Rev. Lett. 81 (1998)
3619
A new technique is described capable of observing the stability of specific states of doubly charged molecular ions with vibrational level resolution. The method is based on the process of double photoionisation using synchrotron radiation. Pairs of threshold electrons identify the initial state and the resulting ions are characterized by their times of flight. Lifetimes have been measured for specific levels of CO2+ and confirm, except for the very lowest levels, the intrinsic instability of this species on the ms time scale.
“Electron excitation of the 1 P and 2 1S+ states of N2O”
B.
Marinković, Z. D. Pešić, R. Panajotović and D. M.
Filipović, Z. Felfli and A. Z. Msezane
Balkan Phys. Lett. 6
(1998) 101 – 5
In this work a system for experimental data analysis is presented. An experiment for measuring relative differential cross sections for the electron-atom scattering oscillator strength (GOS) has been applied to the electron excitation of the 2 1 S+ state of N2O. Measurements were made at electron impact energies of 15, 20, 30, 50 and 80 eV using the electron spectrometer briefly described here. For the transition from the ground state to the 2 1S+ we determined the optical oscillator strength (OOS) to be 0.13 ± 0.02, from the absolute value of DCS at 80 eV electron impact energy and absolute DCS value at 30 eV.
“Some
reasons why the Nier type ion source is not reproducible”
M.
Kurepa, G. Josifov,
Chemical Industry, 52
(1998) 530 – 41
Here we present a computer analysis of the ion trajectories inside a Nier type ion source with two parallel plate electrodes in the repeller-extractormode. This analysis was undertaken in order to find an explanation for the very large differences that appear in relative abundances of ions from particular molecular species obtained by different experimentalists. It is obvious that there are effects in a Nier type ion source that have not been studied properly so far, although very many authors have tried to solve this puzzle. Recent angular and energy analysis of ions, performed in our laboratory, especially of the light ones from dissociative ionization processes, has started to shed some new light on the problem.
“Subband
coding of images: Novel approach and some improvements”
M.
Popović and D. Šević
Facta Universitaties
(Niš) Series: Electronics and Energetics 11 (1998) 321-43
The novel approaches and some computational improvements of subband coding of images are described in this paper. Special attentions given to: 2´1 – D and non separable 2 – D wavelet decompositions, computationally improved 2 – D ELT and fuzzy postprocessing of subband coded reconstructions. A common characteristic of presented case studies is that the problem of image coding is conceptually treated as a two – dimensional one, although separability is largely exploited for efficiency purposes. Some experimental results of simulations of subband coding of images using different algorithms are also presented.
“Experimental study of rotational relaxation
processes by pulsed photoacoustic technique”
M.
Terzić, J. Jovanović – Kurepa and
J. Phys. B: At. Mol. Opt. Phys. 32 (1999)
1193 – 206
The IR pulsed photoacoustic method was used to investigate rotational relaxation processes in MPA. We have examined the bulk rotational relaxation times (tR) and the bulk rotational relaxation cross sections (sR), related to R-R and R-T relaxation mechanisms. The saturation intensities for SF6 gas molecules have been measured in the gas mixtures with CH4 (buffer) molecules, at the constant SF6 gas pressure (0.47 mbar) and variable CH4 gas pressure (1-140 mbar), using the 10P(16) CO2 laser line in the fluences range 0.1-0.7 J cm-2. It has been found that for proper investigation of the rotational relaxation processes, the buffer gas pressure range must be divided into two parts: the low pressure range (0-20 mbar) and the high pressure range (20-140 mbar), according to the behaviour of the saturation intensities versus buffer gas pressure. Consequently, two different sets of values for rotational relaxation parameters are obtained. the found step-function behaviour for sR , shows that the rotational hole-filling effect during the MPA only dominates at low buffer gas pressure (pCH4 Ł 20 mbar). At the higher buffer gas pressures (between 20-140 mbar) the collisional deactivation takes place. We also derive the enhanced absorption cross sections for absorbing SF6 gas molecules from the measured saturation intensities data (at zero buffer gas pressure) confirming the expectation that the enhanced absorbing cross sections are not only a function of laser fluence and buffer gas pressure, but are very strongly dependent on laser beam parameters, too.
“Vibrational to translational relaxation in SF6
– Ar
mixtures: quantitative analysis”
D.
D. Markušev, J. Jovanović – Kurepa, J. Slivka and M. Terzić
J.
Quant. Spectrosc. Radiat. Transfer 61 (1999) 825 – 37
The results and analysis of the vibrational to translational relaxation times tV-T and V-T collisional energy transfer data (áá DE ńń) for SF6 absorbing molecules in the presence of Ar as the buffer-gas, are given. Time-resolved photoacoustic technique and time- resolved absorption method are used and the results obtained with these two different methods applied to the same apparatus are compared. The behavior of SF6-Ar mixtures, given as tV-T results, are presented as well as the energy loss data ( ááDEńń vs áEń ) obtained independently with both approaches. The comparison of ááDEńń quantities is given in the light of discrepancies that are found in the literature, when either technique is used, under similar experimental conditions.
“Normalization
of the measured relative electron differential cross sections for 2 1S+ and 1P states of N2O”
B. Marinković, R. Panajotović, Z. D.
Pešić, D. M. Filipović, Z. Felfli and A. Z. Msezane
J. Phys. B: At. Mol. Opt. Phys. 32 (1999)
1949 – 57
The measured relative electron differential cross sections (DCSs) for excitation of the 2 1 S+ and 1P states of N2O ( Marinković et al 1986 J.Phys. B: At.Mol.Phys. 19 2365 ) have been normalized through a recent forward scattering function for the generalized oscillator strength. Measurements were obtained at electron impact energies of 15, 20, 30, 50 and 80 eV, using the electron spectrometer with crossed electron-molecule beam arrangement. Measured data are corrected at and near zero scattering angles following the analytic behaviour of the momentum dispersion method. Absolute DCS values for the 1P state are compared with the only available set of theoretical data, while for the 2 1S+ state results are presented for the first time.
“On Computing the 2-D FFT”
D.
Šević
IEEE Transactions on Signal
Processing, 47 (1999) 1428 – 31
In this correspondence, a new implementation of the two-dimensional FFT (2-D FFT) is proposed. Compared with the usual separable solution, the new realization of the 2-D FFT has reduced arithmetic complexity. Computational savings are achieved because the 2-D case enables, after some modifications of the basic separable algorithm, scaling of butterfly operators. The new improvement is also applied to other 2-D transforms: DCT-IV, DCT, and lapped transforms.
“Analysis of Self-Organizing Phenomena in Plasma
Focus: Neural Network Approach”
J. Purić, D. Šević and M.
Ćuk
J.
Plasma Fusion Res. SERIES, 2 (1999) 494 – 7
This paper describes application of artificial neural networks to investigation of the self-organizing phenomena in Plasma focus experiment, by means of analysis of magnetic field signals. We used back-propagation neural network, trained as the nonlinear predictor, as a tool to prove deterministic nature of plasma focus magnetic field signals.
“Influence
of the Ishii-Nakayuama Effect on Electron Impact Total Ionization Cross Section
Measurements of Inert Gas Atoms”
M.
Kurepa, G. Josifov and D. Lukić
Journal of Research in
Physics, 28
(1999) 57 – 69
Total ionization cross sections of inert gas atoms in the incident electron energy range from threshold to 100 eV, measured a long time ago have been corrected for the Ishii – Nakayuama effect. The agreement of corrected values with recent data are within errors cited by different authors. This is a final proof that the only cause of error in early experiments was the gas pressure measurement with the McLeod gauge. As a cross check, total ionization cross sections were remeasured for the argon atom from threshold to 1000 eV.
“Electron impact excitation of argon I. The 4s'[1/2]1,
4p[1/2]1 and 4p'[1/2]0 states”
D M Filipović, B P
Marinković, V Pejčev and L Vušković
J. Phys. B: At
.Mol. Opt. Phys. 33 (2000) 677 – 91
We present absolute normalised differential cross sections (DCS’s) for electron - impact excitation of the three individual electronic states of argon: 4s’[1/2]1, 4p[1/2]1 and 4p’[1/2]0. The measurements were performed with incident electron energies of 16, 20, 30, 40, 50 and 80 eV, scattering angles between 5° and 150° and angular resolution better than 2°. The absolute scale for the reference state (4s’[1/2]1) was established by experimental determination of inelastic - to - elastic intensity ratios for 4s’[1/2]1 state at the above impact energies. Absolute inelastic DCS’s for the other two states were determined using the intensity ratios of the peaks in the energy - loss spectra. The absolute DCS’s were extrapolated to 0° and 180° and numerically integrated to yield integral, momentum transfer and viscosity cross sections.
“Electron - impact excitation of argon: II. The
lowest resonance 4s[3/2]1 and metastable 4s[3/2]2 and
4s’[1/2]0 states”
D M Filipović, B P
Marinković, V Pejčev and L Vušković
J. Phys. B: At. Mol. Opt. Phys. 33 (2000) 2081 – 94
Absolute normalized differential electron - impact excitation cross sections (DCSs) are presented for the lowest three electronic states of argon: the lowest resonance 4s[3/2]1 (1s4 in Pashen’s notation) state and two neighbouring metastable 4s[3/2]2 and 4s’[1/2]0 (1s5 and 1s3 in Pashen’s notation) states. Direct, i.e. free of a cascade contribution, excitation cross sections were experimentally obtained for the 4s[3/2]1 state at 20, 40, 50 and 80 eV and for the 4s[3/2]2 and 4s’[1/2]0 states at 20 and 40 eV impact energies. The measurements were performed at scattering angles between 5° and 150° with angular resolution better than 2°. The ratios: r = DCS(4s[3/2]2) / DCS(4s’[1/2]0) and r’ = DCS(4s[3/2]1) / DCS(4s’[1/2]1) were determined and compared with other available experimental and theoretical results. The absolute DCS scale was established with respect to DCSs of the 4s’[1/2]1 state (Filipović et al, 2000 J. Phys. B: At. Mol. Opt. Phys. 33 677) using the peak intensity ratios in the energy - loss spectra. The DCSs were extrapolated to 0° and 180° and numerically integrated to yield integral, momentum transfer and viscosity cross sections.
“Iodine molecule covalente excited states as
determined by threshold electron spectrometry”
M. Kurepa and J. Jureta
J.Serb.Chem.Soc. 65
(2000) 303 – 10
The iodine molecule has been investigated by a threshold electron spectrometer in the incident electron energy range from 1.00 eV to 3.5 eV. From the threshold electron spectrum contributions for excitation of three states known from optical spectrometry have been subtracted. The remaining signal has been interpreted by four curves similar in shape to those in absorption optical spectroscopy into antibonding energy states. The detected maxima have been attributed to the following valence excited states of the iodine molecule: 3P2u(2u), 3P0u (0u-), 3P2g(2g), and 3P1g(1g), respectively. With the knowledge of the energy ranges within which the signal from a particular state appears, the predicted values of equilibrium distances of iodine atom nuclei and estimated values of vibrational transition frequency potential energy curves have been constructed, too.
“Total, direct and dissociative electron impact
ionization cross sections of the acetylene molecule”
G. Josifov, D. Lukić,
N. Djurić and M. Kurepa
J.Serb.Chem.Soc. 65
(2000) 517 – 27
The total electron impact ionization cross sections of the acetylene molecule have been measured in the incident electron energy range from threshold to 1000 eV. These results are compared with other existing data, obtained by direct measurements of this molecular property or by indirect ions. Using three semiempirical equations, the total ionization cross sections were calculated and compared to available data, too. Direct and dissociative ionization cross sections were also calculated by a semiempirical equation and compared to existing data.
“Linear photoacoustic spectroscopy – methodology and
investigation of molecules”
M. Terzić, J. Jovanović – Kurepa
Novi Sad, Univerzitet u Novom Sadu, 2000, Edicija
Univerzitetska naučna knjiga, No. 3, p. 171 (in Serbian)
This is the first book in Serbian about one of modern spectroscopy methods, photoacoustic spectroscopy (PAS). The book includes only linear photoacoustic methods and it is divided in two chapters. In the first chapter the fundamental principles are considered and application of PAS in gases, liquids and solid state. Beside this, different types of experimental detection are described. In the second chapter some aspect of pulsed PAS in liquids in gases are described, such as the theory of photoacoustic waves generation in optically thick liquids and photoacoustic wave propagation and the comparison with experiments, the possibility for measurements of very high and very low optical absorption coefficient for liquids, as well as atmospheric trace gas monitoring.
CONFERENCES: Invited lectures, progress
reports and contributions
“Pulsed
laser photoacoustic spectroscopy of gases: Trace gas detection and multiphoton
absorption studies”
D. D. Markušev, M. Terzić, P. Vujković
Cvijin and J. Jovanović – Kurepa
Applications
of Photonic Technology, Edited by George A.
Lampropoulos, Jacek Chrostowski and Raymond M. Measures, Plenum Press,
The
technique of linear pulsed laser photoacoustic spectroscopy provides the
temporal resolution of the photoacoustic signal, which makes it possible to
separate the sample gas absorption from the background window and cell wall
absorption signals, resulting in an improved signal/noise ratio. The rejection
of a large portion of background signals by temporal resolution leads to high
signal/noise ratio. The experimental technique and high detection sensitivity
was demonstrated previously by investigating the detection of SO2 in
the ultraviolet spectral region. Itis of great interest to extend the technique
into the middle infrared, where an abundance of fundamental absorption transitions
of many gases of interest exists.
“Electron impact cross
sections for sodium and cadmium atoms”
B. P. Marinković
Proc. 15th Summer School and
International Symposium on the Physics of Ionized Gases (SPIG’90), September, 1990, Dubrovnik, Yugoslavia, Atomic Collision Processes and Laser Beam Interactions with Solids,
Eds. M. Milosavljević and Z. Lj. Petrović, New York, Nova Science
Publishers, Inc., 1996. pp.101-114
“Studies of Electron Correlations
in the Photoionisation of Rare Gas Atoms Using Toroidal Multidetectors”
T. J. Reddish, J. P. Wightman and
S. Cvejanović
Proc. 18th Summer School and
International Symposium on the Physics of Ionized Gases (SPIG’96), September 1996, Kotor, Yugoslavia, The Physics of Ionized
Gases, Invited Lecture, Eds. B. Vujičić, S. Đurović and J.
Purić, Novi Sad, Faculty of Sciences, Institute of Physics Novi Sad, 1997,
pp.141 – 52
Gas
phase photoionisation studies provide a diverse wealth a phenomena which need
to be investigated to further our understanding of ionisation mechanisms, many
of which are important in atmospheric photo-reactions and in plasmas. In our
case we employ vacuum ultra-violet (VUV) light, produced by synchrotron
radiation, and measure the energy and angular distributions of electrons
emitted from photoionisation of rare gas atoms and molecules. In particular, a
photoelectron spectrometer has been developed to investigate photodouble
ionisation (PDI). Novel toroidal analysers have been employed, which energy
select the photoelectrons while preserving the initial angle of emission. As a direct
consequence of these focusing properties, the angular distribution of the
electrons are mapped directly onto the detectors and the resulting efficiency
gain helps to compensate for the low cross section of the (g,2e) process.
“Photoionization studies of
rare-gas atoms using angle dispersive electron analysers and VUV synchrotron
radiation”
S. Cvejanović, J. Wightman
and T. J. Reddish
Proc.
3rd South European Conference on Atomic and Molecular Physics, (SECAMP 96), October 1996, Kos, Greece,
Theoretical and Physical Chemistry Institute National Hellenic Research
Foundation, Eds. C. A. Nicolaides, Y. Kominos, T. Mercouris and E. D.
Simandiras.
The
use of photons as bombarding particles in processes which involve participation
of two or more target electrons simultaneously is well suited for the study of
electron correlations, as without some from of electron-electron interaction
(either in the initial or final state) such processes are impossible. The other
reason for preferring photon projectiles to electrons is in relative simplicity
in separating the effects of symmetry from the dynamic effects.
Low
energy electron spectrometry
M.
V. Kurepa
Proc. 3rd
Conference of the Society of Physical Chemists of Serbia “Physical Chemistry
‘96”, Book
of Abstracts, Belgrade, 1996, pp.49 – 50
A
review will be presented of experimental results obtained during the last few
years in the Atomic Collision Laboratory,
“Electron
scattering by atoms and stepwise electron laser excitation”
B. Marinkovic, R. Panajotovic, Z. D. Pesic and D. M.
Filipovic
Proc.Int.Conf. "The Centenary of the
Electron", August 1997,
In this short review,
two experimental set-ups designed at the Institute of Physics, Belgrade, are covered:
ESMA (Electron Spectrometer for Molecules and Atoms) and SELE (Stepwise
Electron Laser Excitation). The focus of interest are investigations of elastic
scattering, excitation processes, resonances, autoionizing states, energy loss
spectroscopy, differential cross sections measurements, integrated (integral,
momentum transfer, viscosity) cross sections and critical minima. The targets
used to investigate such processes include rare gas atoms (Ne, Ar, Kr, Xe),
metal vapours (Na, Zn, Cd, Hg) and small molecules -(N2O, H2S).
Some details of elastic electron scattering by argon atoms and resonances in
electron – cadmium atom scattering are presented. Also, a new design of an
apparatus for stepwise electron laser excitation based on a throchoidal
electron monochromator is presented.
“Electron impact ionization of 
”
J. Jureta, E. Bahati, H.H.Cherkani and P. Defrance
6th
EPS Conference on Atomic and Molecular Physics, Siena, Italy 1998, Contributed Papers, Eds. C. Biancalana, P.
Bicchi, E. Mariotti, Europhysics
Conference Abstracts, Vol.22D p.Inv.
77
“Electron
impact ionization and electron attachment cross sections of some molecules of
astrophysical importance”
M.
Kurepa
4th
Yugoslav-Romanian Astrophysical Meeting,
Here an insigth is
presented into effords on total ionization and total electron attachment cross
section measurements of small molecules of astrophysical interest, as a part of
research in the Institute of Physics in Beograd.
“Attempts
to connect basic units of time and mass”
M.
V. Kurepa
Proc of the Congress of
Metrologists of Yugoslavia, Belgrade, Eds. I. Župunski and G. Danković, (Federal Bureau of Measures
and Precious Metals, Belgrade) part 2, 1998, pp.167 – 89
The review does with the present status of mass measurements of atomic particles, and the question whether in the near future the SI mass standard, the kilogram will be replaced. It is pointed out that in the range of masses from the SI unit: 1 (kg) down to the unified atomic mass unit: 1 (u), two narrower ranges can be distinguished. In the upper one, from 1 (kg) to 10-9 (g) masses can be measured by methods based on equality of momenta, of equality of momenta, of equality of forces, with a relative error (RE) of the order of 10-8. In the lower range, from just below 1 (u) to 105 (u) only relative atomic masses (RAM) could be determined by different mass spectrometric methods (some of them briefly discussed) with a RE of the order of 10-6. The connection between the two ranges is the Avogadro’s constant whose last published value is known to be with a RE of 10-7. Recent experiments with the Penning ion trap formed a new approach. The earlier measurements of the proton to electron mass ratio, important in atomic physics, have been extended to measurements of RAM of other atoms. The most important fact in RAM determinations with an ion trap is that they are obtained via resonant frequencies of ion motions inside the trap. This is a direct connection of the RAM determination in units of (u) via the unit of frequency (Hz), to the SI basic unit of time, the second (s) that can be now determined with a RE of 10-13. The direct connection of the two ranges of masses is difficult to ascertain and experimentally not yet mastered. It is considered that they could be overlapped by applying some other methods, not yet used. The experiment for the electron charge determination with the oil of Milikan can be treated as an electrical scale. It is one of the possible ways to extend the measurable mass range downwards for at last two order of magnitude, to 10-11 (g). The very recent mass spectrometric investigations of the fuleren, cluster of carbon atoms: C60’ can lead to extension of the mass scale upwards. Namely, if the fuleren is made of 12C atoms only, then its relative atomic mass of 720 (u) can be introduced as a new standard for the unified mass unit, instead of the single 12C atom. Fuleren, on the other side, can be used as a standard in mass spectrometry for higher RAM measurements. A possible overlap of the two mass ranges will connect them directly, and it will avoid the Avogadro’s constant altogether. If this could be achieved, a replacement of the mass standard in SI from the now accepted 1 (kg) prototype made of platinum and iridium, could be expected, to the mass of an elementary particle atom or atomic group as a primary mass standard for SI.
“Total
and partial electron impact ionization and electron attachment cross sections
of some small molecules”
M. V. Kurepa
Proc. 19th
Summer School and International Symposium on the Physics of Ionized Gases (SPIG’98), August 31 –
September 4, 1998, Zlatibor, Yugoslavia,
The Physics of Ionized Gases, Invited Lectures, Topical Invited Lectures
and Progress Reports, Eds. N. Konjević, M. Ćuk and S.
Đurović, Belgrade, University of Belgrade, 1999, pp. 73 – 92
The present status in total and partial electron impact ionization and electron attachment cross section measurements of some small molecules is briefly reviewed. Although measurements of these atomic collision parameters have been done for more than sixty years, the knowledge of them has not reached a satisfactory level. This situation has been slightly improved lately, since previous reviews on the subject were published.
In total electron impact ionization and in electron attachment cross section measurements, sets of different authors, even for the most common molecules, differ between themselves for about 10 %. This is greater than the relative error claimed by authors. The present situation will be shown for some molecules of environmental, astrophysical and plasma physical interest. Possible sources of these differences will be analyzed.
Partial electron impact ionization cross section for formation of molecular parent ions and fragment ions, as well as for electron attachment cross section, are known with a much lesser certainty. Differences among authors for a factor 2 – 3 are not rare, but sometimes they reach even one order of magnitude. An explanation based on energy and angular distribution measurements of fragment ions, that influence all measurements with mass dispersive elements, will be offered.
“Electron
impact ionization of polyatomic ions”
J.
Jureta and P. Defrance
Proc. 19th
Summer School and International Symposium on the Physics of Ionized Gases (SPIG’98), August 31 –
September 4, 1998, Zlatibor, Yugoslavia,
The Physics of Ionized Gases, Invited Lectures, Topical Invited Lectures
and Progress Reports, Eds. N. Konjević, M. Ćuk and S.
Đurović, Belgrade, University of Belgrade, 1999, pp. 139 – 55
The cross-section measurements for polyatomic ions have a great importance in the understanding of processes inside chemical reactions, interstellar space and as a checking point for theoretical calculations. The aim of these measurements is to give more information about shape and magnitude of the electron impact ionization cross-sections for the molecular ions as CO2*, H3O*, D3O*, D2OH* which play important role in the astrophysical processes and chemical reactions.
“Completing
of electron – atom
scattering picture for argon and the rare gases”
D.
M. Filipović and B. P. Marinković
Proc. 20th
Summer School and International Symposium on the Physics of Ionized Gases (SPIG'2000), September 2000,
Zlatibor, Yugoslavia, Abstracts of Invited Lectures, Topical Invited Lectures
and Progress Reports and Contributed Papers,
Eds. Z. Lj. Petrović, M. M. Kuraica, N. Bibić and G. Malović,
Belgrade, Institute of Physics, Faculty of Physics, Institute
"Vinča", 2000, p. 9
“Electron
– ion
recombination at very low energy”
R.
Schuch, N. Badnell, N. Eklow, P. Glans, E. Lindroth, S. Madžunkov and M. Tokman
Proc. 20th
Summer School and International Symposium on the Physics of Ionized Gases (SPIG'2000), September 2000,
Zlatibor, Yugoslavia, Abstracts of Invited Lectures, Topical Invited Lectures
and Progress Reports and Contributed Papers,
Eds. Z. Lj. Petrović, M. M. Kuraica, N. Bibić and G. Malović,
Belgrade, Institute of Physics, Faculty of Physics, Institute
"Vinča", 2000, p. 15
“Intra
and intermolecular vibrational energy transfer in different gas mixture”
D.
D. Markušev
Proc. 20th
Summer School and International Symposium on the Physics of Ionized Gases (SPIG'2000), September 2000,
Zlatibor, Yugoslavia, Abstracts of Invited Lectures, Topical Invited Lectures
and Progress Reports and Contributed Papers,
Eds. Z. Lj. Petrović, M. M. Kuraica, N. Bibić and G. Malović, Belgrade,
Institute of Physics, Faculty of Physics, Institute "Vinča",
2000, p. 17
“Some
ionic valence states of iodine molecule detected by threshold electron
spectrometry”
M.
Kurepa and J. Jureta
Proc. 10th
Congress of Physicists of Yugoslavia, March, 2000, Vrnjačka banja, Yugoslavia,
Zbornik radova 1, Eds. B. Milić and D. Markušev, Belgrade, Serbian
Physical Society, 2000, pp. 33 – 40 (in Serbian,)
The excitation of iodine molecule was investigated using threshold electron spectrometer with 25 meV energy resolution. A part of electron threshold spectrum from 6.3 to 7 eV was interpreted in terms of vertical excitation of several ionic valence states that dissociate into ionic pair. Some parameters of excited states are known from optical emission and absorption spectroscopy, two – photon absorption experiments and optical – optical twofold resonance. From these parameters, potential energy curves were constructed. Equilibrium distances wee determined for the six valence states of molecular iodine.
“200
years from discover of infrared”
D.
D. Markušev
Proc. Seminar
for primary and secondary school physics teachers, Vrnjačka banja, Serbian Physical Society, 2000, pp 26 – 33 (in
Serbian)
“On
the normalisation and calibration procedures for angular distributions measured
on angle-dispersive photoelectron spectrometers”
S.
Cvejanović, R. C. Shiell and T. J. Reddish
Euroconference Coincidence
Studies of Electron and Photon Impact Ionisation, International Centre for
Theoretical Physics (ICTP), Trieste, 1995, pp. 57
“Time – resolved photoacoustic study of V – T
relaxation in SF6-Ar gas mixtures”
D. D.
Markušev, J. Jovanović – Kurepa, M. Terzić
Proc. 28th EGAS Conference, European
Group for Atomic Spectroscopy, 16 – 19 July 1996, Technische Universitat Graz, Institut fur
Experimentalphysik, Abstracts, Editor: L. Windhoiz, p. D4
– 103
“Influence
of argon atoms as the buffer – gas during the multiphoton
absorption in SF6 – Ar mixtures”
D. D.
Markušev, J. Jovanović – Kurepa, M. Terzić
Proc. 28th EGAS Conference, European
Group for Atomic Spectroscopy, 16-19 July 1996, Technische Universitat Graz, Institut fur Experimentalphysik, Abstracts, Editor: L. Windholz, p. D4 – 104
”Angular
distribution of the fast ion induced post-collision interaction in p – Kr, Ne
collisions”
Gy.
Vikor, L. Toth, S. Ricz, B. Sulik, J. Vegh, A. Kover and P. Pelicon
17. Arbeitsbericht, Arbeitsgruppe, Energiereiche
Atomare Stosse, 1996, pp. 39 – 40
“Differential cross section measurements for elastic
scattering of electrons from Ar and Kr”
D. Cvejanović and A. Crowe
Proc. 18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B.
Vujičić and S. Đurović, Novi Sad, Faculty of Sciences,
Institute of Physics Novi Sad, 1996, pp.21 –4
“Resonances in elastic e‑/Ar
scattering above ionization limit”
R.
Panajotović, V. Pejčev, B. Marinković and D. Filipović
Proc. 18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B.
Vujičić and S. Đurović, Novi Sad, Faculty of Sciences, Institute
of Physics Novi Sad, 1996, pp.30 – 3
“Electron
impact excitation of the 41F state in helium”
D. Cvejanović and A. Crowe
Proc.
18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B. Vujičić and S. Đurović, Novi Sad, Faculty
of Sciences, Institute of Physics Novi Sad, 1996, pp.34 – 6
“Test of randomness of binary electron – atom collision events”
J.
Predojević, R. Panajotović, V. Pejčev, B. Marinković and D.
M. Filipović
Proc. 18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B.
Vujičić and S. Đurović, Novi Sad, Faculty of Sciences,
Institute of Physics Novi Sad, 1996, pp.37 – 9
“Absorption
effects in elastic electron scattering by argon atom”
J.
Matijević, R. Panajotović, B. Marinković, V. Pejčev and D.
M. Filipović
Proc. 18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B.
Vujičić and S. Đurović, Novi Sad, Faculty of Sciences,
Institute of Physics Novi Sad, 1996, pp.40 – 2
“Analysis of the energy loss spectra with expert
system”
V.
Cvjetković, V. Bočvarski, B. Radenković
Proc. 18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B.
Vujičić and S. Đurović, Novi Sad, Faculty of Sciences,
Institute of Physics Novi Sad, 1996, pp.43 – 6
“Electron
photon correlations in helium-small angle data for 31D state”
D.
Cvejanović, D. T. McLaughlin, D. McDonald and A. Crowe
Proc. 18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B.
Vujičić and S. Đurović, Novi Sad, Faculty of Sciences,
Institute of Physics Novi Sad, 1996, pp.pp.47 – 50
“Using
diode lasers for atomic collision physics”
Z.
D. Pešić, B. Marinković, M. Minić, D. Pantelić, I.
Nečajev, B. Panić, R. Panajotović and D. M. Filipović
Proc. 18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B.
Vujičić and S. Đurović, Novi Sad, Faculty of Sciences,
Institute of Physics Novi Sad, 1996, pp.51 – 4
“Total electron impact ionization
cross section from acetylene molecule”
N. L. Đurić, D. V. Lukić, G. D. Josifov, M. Z. Minić and M. V.
Kurepa
Proc.
18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B. Vujičić and S. Đurović, Novi Sad, Faculty
of Sciences, Institute of Physics Novi Sad, 1996, pp.70 – 2
“Ion energy and angular
distributions from electron impact ionization of CH4”
S. Madžunkov, D. B. Popović,
I. Čadež, M. V. Kurepa and M. Minić
Proc.
18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B. Vujičić and S. Đurović, Novi Sad, Faculty
of Sciences, Institute of Physics Novi Sad, 1996, pp.77 – 80
“The Measurement of the Triple Differential
Cross Section in Helium at Intermediate Energies”
T. J. Reddish, J. P. Wightman and
S. Cvejanović
Proc.
18th SPIG, Kotor, Yugoslavia 1996, Contributed
Papers, Eds. B. Vujičić and
S. Đurović, Novi Sad, Faculty of Sciences, Institute of Physics Novi
Sad, 1996, pp.87 – 90
“Resonance
ionization of SO2 molecule”
A.
Marinković, B. Marinković and D. M. Filipović
Proc. 18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B.
Vujičić and S. Đurović, Novi Sad, Faculty of Sciences,
Institute of Physics Novi Sad, 1996, pp.103 – 6
“Collisional
deactivation of vibrationally highly excited SF6 – CH4”
J.
Jovanović – Kurepa,
D. D. Markušev, M. Terzić
Proc. 18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B.
Vujičić and S. Đurović, Novi Sad, Faculty of Sciences,
Institute of Physics Novi Sad, 1996, pp.111 – 14
“Measurements
of rotational relaxation times in SF6
– CH4 gas mixtures”
M.
Terzić, J. Jovanović – Kurepa and D. D. Markušev
Proc. 18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B.
Vujičić and S. Đurović, Novi Sad, Faculty of Sciences,
Institute of Physics Novi Sad, 1996, pp 115 – 18
“Optical
measurement of the angular distribution of metastable hydrogen atoms (2s) produced
by charge exchange in the energy range 100-4000 eV”
J.
Jureta, X. Urbain, P. C. Karangwa and F. Brouillard
Proc. 18th SPIG, Kotor, Yugoslavia 1996, Contributed Papers, Eds. B.
Vujičić and S. Đurović, Novi Sad, Faculty of Sciences,
Institute of Physics Novi Sad, 1996, pp.119
“Electron
capture to the continuum states at impact of neutral atoms”
L.
Sarkadi, M. Kuzel, L. Vikor, P. A. Zavodszky, R. Maier, D. Berenyi and K. O.
Groeneveld
6th Workshop on
Fast Ion – Atom Collisions, Program and Abstracts,
Debrecen, 1996
“The
Auger – line intensity enhancement due to the fast ion – atom post – collision
interaction”
Gy.
Vikor, S. Ricz, B. Sulik, A. Kover, L. Toth, J. Vegh and B. Paripas
6th Workshop on
Fast Ion – Atom Collisions, Program and Abstracts, Debrecen,
1996
“Angular
distribution of KVV Auger-line intensities from N2 molecules induced
by 1.5 and 2 MeV protons”
Gy.
Vikor, S. Ricz, L. Toth, B. Sulik, J. Vegh and A. Kover
6th Workshop on
Fast Ion – Atom Collisions, Program and Abstracts,
Debrecen, 1996
“Energy
Loss Spectroscopy of Cadmium Autoionizing Levels”
B.
Marinković, V. Pejčev and D. M. Filipović
Proc. 3rd South European Conference on Atomic and Molecular Physics, (SECAMP
– 96), October 1996, Kos, Greece, Theoretical
and Physical Chemistry Institute National Hellenic Research Foundation, Eds. C. A. Nicolaides, Y. Kominos, T.
Mercouris and E. D. Simandiras
“Energy
and Angular Distribution of H+ Ions from Dissociative Ionization of
the Water Molecule”
S. Madžunkov,
I. Čadež and M. Kurepa
Proc. 3rd
Conference of the Society of Physical Chemists of Serbia “Physical Chemistry
‘96”, Book
of Abstracts, Belgrade, 1996, pp.107 – 8
“Partial
Ionization Cross Section of the CS2 Molecule by Electron Impact”
Đ.
Vikor, G. Josifov and M. Kurepa
Proc. 3rd
Conference of the Society of Physical Chemists of Serbia “Physical Chemistry
‘96”, Book
of Abstracts, Belgrade, 1996, pp.115 – 16
“Eksperiment za istraživanje laserski indukovanih
multifotonskih apsorpcionih i nekih relaksacionih procesa u molekulima”
J. Jovanović-Kurepa, D. Markušev i M.
Terzić
Kvantni svet, Urednik R.
Antanasijević, Beograd, Institut za fiziku, 1996, str. 147 – 55
“Aparatura za merenje kaskadnih ekscitacionih
procesa”
B. Marinković i Z. Pešić
Kvantni svet, Urednik R.
Antanasijević, Beograd, Institut za fiziku, 1996, str. 175 – 6
“Aparatura za merenje preseka za jonizaciju i zahvat
– ZAGA”
M. Kurepa, G. Josifov i D. Lukić
Kvantni svet, Urednik R.
Antanasijević, Beograd, Institut za fiziku, 1996, str. 177 – 9
“Elektronski spektrometar - ESMA”
B. Marinković, V. Pejčev, D.
Filipović i R. Panajotović
Kvantni svet, Urednik R.
Antanasijević, Beograd, Institut za fiziku, 1996, str. 180 – 1
“Aparatura za merenje ugaonih raspodela – UGRA”
I. Čadež, S. Madžunkov i D. Popović
Kvantni svet, Urednik R.
Antanasijević, Beograd, Institut za fiziku, 1996, str. 182 – 3
“Quasifree Electron Scattering on Atoms in the
Inverse Kinematic System”
T. Jalowy, M. Kuzel, R. Wunsch, R. Neugebauer, D.
Hofmann, L. Sarkadi, A. Bader, L. Vikor, P. Focke, D. H. Jakubassa – Amundsen,
M. W. Lucas, G. Sigaud and K. O. Groeneveld
ATOMKI, Annual
Report,
Institute of Nuclear Research of the Hungarian Academy of Sciences Debrecen,
Hungary, 1996, p. 31
“Absence of the cusp in the single-electron
detachment spectrum of the He- ion”
L. Vikor and L. Sarkadi
ATOMKI, Annual
Report,
Institute of Nuclear Research of the Hungarian Academy of Sciences Debrecen,
Hungary, 1996, p. 32
“Observation of Electron Impact Inner-Shell Excitation
of Argon by means of Satellite Auger Spectra”
B. Paripas, Gy. Vikor and S. Ricz
ATOMKI, Annual
Report,
Institute of Nuclear Research of the Hungarian Academy of Sciences Debrecen,
Hungary, 1996, p. 34
“Angular distribution of KVV Auger-line intensities
from N2 molecules induced by 1.5 and 2 MeV protons”
Gy. Vikor, S. Ricz, L. Toth, B. Sulik, J. Vegh and
A. Kover
ATOMKI, Annual
Report,
Institute of Nuclear Research of the Hungarian Academy of Sciences Debrecen,
Hungary, 1996
“Enhancement of the Auger-line intensity due to the
fast proton – neon post – collision interaction”
Gy. Vikor, S. Ricz, B. Sulik, A. Kover, L. Toth and
J. Vegh
ATOMKI, Annual
Report,
Institute of Nuclear Research of the Hungarian Academy of Sciences Debrecen,
Hungary, 1996, p. 36
“Post – collision interaction between
prompt-electrons and Auger – electrons at fast ion – atom collisions”
Gy. Vikor, L. Gulyas, S. Ricz, B. Sulik, A. Kover
and P. Pelicon
ATOMKI, Annual
Report,
Institute of Nuclear Research of the Hungarian Academy of Sciences Debrecen,
Hungary, 1996
“Measurements
of Auger spectra of Kr and Xe by electron and proton bombardment”
T. Kylli, A. Hiltunen, S. Aksela, Gy. Vikor, S. Ricz, B. Sulik and
Z. Benjamin
ATOMKI, Annual
Report,
Institute of Nuclear Research of the Hungarian Academy of Sciences Debrecen,
Hungary, 1996, p. 41
”Critical
minima in elastic electron scattering by argon”
R.
Panajotović, D. M. Filipović, B. Marinković, V. Pejčev, M.
Kurepa and L. Vušković,
Proc. Joint APS/AAPT Meeting
with DAMOP Annual Meeting, Washington, D.C., 1997. Abstract 10015
“Photodouble ionisation triple differential
cross-section measurements of deuterium”
J. P. Wightman, S. Cvejanović, M. A. MacDonald
and T. J. Reddish
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. WE 018
“The Kr L2,3M4,5M4,5
Auger spectrum: Structure and alignment at proton impact”
B. Paripas, Gy. Vikor and S. Ricz
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. WE 175
“Position of DCS minima in elastic electron-argon
scattering”
D. M. Filipović and B. Marinković
Proc. XX. ICPEAC,
Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. TH 005
“Critical minima in elastic electron scattering by
argon”
R. Panajotović, D. Filipović, B.
Marinković, V. Pejčev, M. Kurepa and L. Vušković
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. TH 006
“Position of DCS minima in elastic electron
scattering by mercury”
Z. D. Pešić, R. Panajotović, B.
Marinković, V. Pejčev and D. M. Filipović
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. TH 007
“Electron – polarized photon correlation studies for
electron excitation of the 31D state of helium”
D. Cvejanović, D. T. McLaughlin, D. G. McDonald
and A. Crowe
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. TH 040
“The post – collision effect of prompt electrons in
fast ion – atom collision”
Gy. Vikor, S. Ricz, B. Sulik, L. Gulyas and A. Kover
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. TH 130
“Post – collision interaction at the beam direction
measured with different acceptance angle of the electron spectrometer”
Gy. Vikor, S. Ricz, B. Sulik, L. Toth and A. Kover
Proc. XX. ICPEAC,
Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. TH 131
“The contribution of the electron loss process to
the continuous electron spectra from 100 keV/u Cq+, Nq++He
collisions at electron emission angles from 00 to 1800”
B. Sulik, A. Kover, S. Ricz, Gy. Vikor, L. Toth and
D. Berenyi
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997, Edited
by F. Aumayar, G. Betz and H. P. Winter, p. TH 192
“Absolute cross sections for electron impact
ionization of CO2+”
J. Jureta, E. Bahati, P. Defrance and D. Belić
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. FR 006
“Threshold steps in the photoionization of the
heavier rare gases”
S. Cvejanović, J. P. Wightaman and T. J.
Reddish
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. MO 078
“Excitation of the 22p state of hydrogen
by electron impact”
H. A. Yalim, M. Dogan, D. Cvejanović and A.
Crowe
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. MO 088
"Determination of small-angle electron
differential cross sections, from their larger angle measurements"
Z. Felfli, P. Ozimba, A. Z. Msezane, T. Ester, J.
Kessler, M. Zubek, N. Gulley, A. Danjo, G. C. King, B. Marinković, D.
Filipović and L. Vušković
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. MO107
“Fragmentation of carbon disulfide molecule by
electron impact”
Gy. Vikor, G. Josifov and M. V. Kurepa
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. MO 152
“Energy – loss spectra of vibrationally excited SF6
molecules in SF6 – Ar mixtures”
D. D. Markušev, J. Jovanović – Kurepa, M.
Terzić
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. TU 020
“Multiphoton absorption in gas mixtures:
Measurements of rotational relaxation cross sections”
M. Terzić, D. D. Markušev and J. Jovanović
– Kurepa
Proc. XX.
ICPEAC, Scientific Program and Abstracts of Contributed Papers, Vienna, Austria, 1997,
Edited by F. Aumayar, G. Betz and H. P. Winter, p. TU 021
"Electron excitation of the 1Π
and 21Σ+ states of N2O"
B. Marinković, V. Pejčev, D. M.
Filipović and Z. D. Pešić
Proc. 3rd
General Conference of the Balkan Physical Union (BPU-3) Programme and Abstracts, Cluj-Napoca,
Romania, 1997, p. 3O – 006
“Contributions of the collisional effects to the MPA
processes”
J. Jovanović – Kurepa, M. Terzić and D. D.
Markušev
Proc. 3rd
General Conference of the Balkan Physical Union (BPU-3) Programme and Abstracts, Cluj-Napoca,
Romania, 1997, p. 3P – 009
Proceedings Supplement of the Balkan Phys.Lett. 5
(1997) 143
“IR photoacoustic technique used for differential
cross section determination in MPA processes”
M. Terzić, J. Jovanović – Kurepa and D. D.
Markušev
Proc. 3rd
General Conference of the Balkan Physical Union (BPU-3) Programme and Abstracts, Cluj-Napoca,
Romania, 1997, p. 3P – 010
printed as “Application of PA Spectroscopy in
Determination of Differential Cross Sections in MPA Processes” in Proceedings
Supplement of the Balkan Phys. Lett. 5 (1997) p. 147
“Synthesis of the Ar L2,3M2,3M2,3
Auger spectrum”
Gy. Vikor, L. Vikor, L. Sarkadi and L. Gulyas
18.
Arbeitsbericht, Arbeitsgruppe Energiereiche Atomare Stosse, 1997, p. EAS – 18
“Veličina
atoma i molekula kako ih u sudaru 'vidi' upadni elektron”
D.
M. Filipović and B. Marinković
Zbornik
saopštenja sa simpozijuma Elektron - sto godina od otkrića, sveska 7, SANU
i Zavod za izdavanje udžbenika, Beograd, 1997, str. 33 – 6
“Elastično rasejanje elektrona na molekulu vodonika”
S.
Madžunkov, M. Kurepa i I. Čadež
Zbornik
saopštenja sa simpozijuma Elektron - sto godina od otkrića, sveska 7, SANU
i Zavod za izdavanje udžbenika, Beograd, 1997, str. 37 – 40
“Poslesudarna
interakcija u jon-atomskim sudarima visoke energije”
Gy.
Víkor, S. Ricz, B. Sulik i A. Kövér
Zbornik
saopštenja sa simpozijuma Elektron - sto godina od otkrića, sveska 7, SANU
i Zavod za izdavanje udžbenika, Beograd, 1997, str. 49 – 52
“Otkidanje
elektrona sa H- i He- jona pri sudarima na visokim
energijama”
L.
Víkor i L. Sarkadi
Zbornik
saopštenja sa simpozijuma Elektron - sto godina od otkrića, sveska 7, SANU
i Zavod za izdavanje udžbenika, Beograd, 1997, str. 53 – 6
“Photoacoustic
analysis of laser induced infrared multiphoton absorption in SF6 –
Ar mixtures”
D.
D. Markušev, J. Jovanović – Kurepa and M. Terzić
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics,
University of Belgrade, Belgrade), 1998, pp.35 – 8
“Vibrational
to translational energy – loss evaluation in SF6 – Ar mixtures”
D.
D. Markušev, J. Jovanović – Kurepa and M. Terzić
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics,
University of Belgrade, Belgrade), 1998, pp.39 – 42
“Excitation
of the 22P state hydrogen studied by the electron-photon angular
correlation technique”
H.
A. Yalim, D. Cvejanović and A. Crowe
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics,
University of Belgrade, Belgrade), 1998, pp.61 – 4
“Excitation
of the 33D state of helium by electron impact”
A.
Crowe, D. Cvejanović, B. P. Donnelly, D. T. McLaughlin, D. V. Fursa, I.
Bray and K. Bartschat
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics,
University of Belgrade, Belgrade), 1998, pp.65 – 8
“Electron
interactions with zinc atom”
R.
Panajotović, V. Pejčev and B. Marinković
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics,
University of Belgrade, Belgrade), 1998, pp.69 – 71
“Energy
and angular distribution of H+ ions from dissociative ionization
processes of the water molecule”
S.
Madžunkov, I. Čadež and M. Kurepa
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics,
University of Belgrade, Belgrade), 1998, pp.97 – 100
“Kinematics
of hydrogen dissociative ionization induced by electron impact”
I.
Čadež, S. Madžunkov and M. Kurepa
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics,
University of Belgrade, Belgrade), 1998, pp.101 – 4
“Partial
electron attachment cross sections of the CCl2F2
molecule”
M.
V. Kurepa
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics,
University of Belgrade, Belgrade), 1998, pp.105 – 8
“Total
electron impact ionization cross sections of C2F6 and C3F8
molecules revisited”
M.
V. Kurepa
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics,
University of Belgrade, Belgrade), 1998, pp.109– 12
“Direct
and dissociative ionization of water and heavy water molecules”
G.
Josifov, D. Lukić and M. Kurepa
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics,
University of Belgrade, Belgrade), 1998, pp.113 – 16
“Problems
of ion collection in the parallel plate interaction chamber for total
ionization cross sections measurements”
G.
Josifov and M. Kurepa
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics,
University of Belgrade, Belgrade), 1998, pp.117 – 20
“Absolute
cross – sections measurement for electron impact ionization of H3O+
from threshold to 2500 eV”
J.
Jureta, E. Bahati, H. Cherkani and P. Defrance
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics, University
of Belgrade, Belgrade), 1998, pp.125 – 26
“Logical
model of information system in atomic collision physics”
M.
Bilbija, B. Marinković, V. Cvjetković, V. Nikolić and V.
Bočvarski
Proc. 19th SPIG, Zlatibor, Yugoslavia 1998,
Contributed Papers, Eds. N.
Konjević, M. Ćuk and R. Videnović, (Faculty of Physics,
University of Belgrade, Belgrade), 1998, pp.143 – 46
“Total
electron impact ionization cross sections for carbonyl sulfide molecule”
D.
V. Lukić, G. D. Josifov and M. V. Kurepa
6th
EPS Conference on Atomic and Molecular Physics, Siena, Italy 1998, Contributed Papers, Eds. C. Biancalana,
P. Bicchi, E. Mariotti, Europhysics
Conference Abstracts, Vol.22D p.4-101
“Electron
– Zn atom crossed beam experiment”
R.
Panajotović, V. Pejčev, Z. D. Pešić and B. Marinković
6th
EPS Conference on Atomic and Molecular Physics, Siena, Italy 1998, Contributed Papers, Eds. C. Biancalana,
P. Bicchi, E. Mariotti, Europhysics
Conference Abstracts, Vol.22D p.4-114
“Causes
of the big differences of relative abundances in mass spectra of molecules”
M.
Kurepa and G. Josifov
4th
Int. Conf. on Fundamental and Applied Aspects of Physical Chemistry, Papers,
Eds. S. Ribnikar and S. Antić, Society of Physical Chemists of Serbia, 4,
1998, pp. 77 – 9
“Total,
direct dissociative ionization cross sections of NH3 and PH3
molecules”
M.
Kurepa and G. Josifov
4th
Int. Conf. on Fundamental and Applied Aspects of Physical Chemistry, Papers,
Eds. S. Ribnikar and S. Antić, Society of physical Chemists of Serbia, 4,
1998, pp. 98 – 100
“Electron
scattering by Zn atom”
R.
Panajotović, V. Pejčev and B. Marinković
4th
Int. Conf. on Fundamental and Applied Aspects of Physical Chemistry, Papers,
Eds. S. Ribnikar and S. Antić, Society of physical Chemists of Serbia, 4,
1998, pp. 104 – 6
“Ionization
de H3O+ par impact d’electrons”
E.
Bahati, J. Jureta, H. Cherkani and P. Defrance
Journees
de spectroscopie moleculare, 3eme Colloque, Reims, 1998, pp. 103
“Eksperimentalni
uređaj ESMA”
R.
Panajotović, B. Marinković, V. Pejčev i D. Filipović
Zbornik
predavanja sa republičkog seminara o nastavi fizike, Društvo fizičara
Srbije, Kragujevac, 1998, str. 156 – 59
“Aparatura
za merenje preseka za jonizaciju i zahvat – ZAGA”
G.
Josifov, D. Lukić, M. Kurepa
Zbornik
predavanja sa republičkog seminara o nastavi fizike, Društvo fizičara
Srbije, Kragujevac, 1998, str. 194 – 98
“Merenje
apsolutnih efektivnih preseka za jonizaciju atoma i molekula udarom elektrona”
M.
Kurepa
Simpozijum
o merenjima i mernoj opremi, Zbornik
radova, knj.1, Eds. I. Župunski and G. Danković, Savezni zavod za mere
i dragocene metale, Beograd, 1998, str.87 – 97
“Merenje
preseka za elastično rasejanje elektrona na atomima metala”
R. Panajotović, B. Marinković, D.
Filipović i V. Pejčev
Simpozijum
o merenjima i mernoj opremi, Zbornik
radova, knj.1, Eds. I. Župunski and G. Danković, Savezni zavod za mere
i dragocene metale, Beograd, 1998, str.99 – 107
“Detektor jona u vazduhu”
D.
Filipović, B. Marinković, M. Minić i I. Čadež
Simpozijum
o merenjima i mernoj opremi, Zbornik
radova, knj.1, Eds. I. Župunski and G. Danković, Savezni zavod za mere
i dragocene metale, Beograd, 1998, str.117 – 22
“Uređaj
za baždarenje merila niskog pritiska”
M.
Kurepa, Z. Nikitović
Simpozijum
o merenjima i mernoj opremi, Zbornik
radova, knj.2, Eds. I. Župunski and G. Danković, Savezni zavod za mere
i dragocene metale, Beograd, 1998, str.677 – 86
“Difuzione permeacione cevčice kao standardi
spravljanja smeša gasova niskih pritisaka”
M. Tasić, I. Čadež, N. Đurić
Simpozijum o merenjima i mernoj opremi, Zbornik radova, knj.2, Eds. I. Župunski
and G. Danković, Savezni zavod za mere i dragocene metale, Beograd, 1998,
str. 917 – 26
“Osnovne
osobine elektrona – sto godina posle njegovog otkrića”
M.
Kurepa
40
godina elektronske mikroskopije, 1998, str.147
“Quantitative
analysis of multiphoton absorption in SF6 – N2”
D. Markušev, J. Jovanović – Kurepa and M.
Terzić
Proc. XXI ICPEAC, Sendai, Japan,
1999, Abstracts of Contributed Papers,
p. 160 – MO049
"Differential cross sections for electron
elastic scattering by zinc atom"
R. Panajotović, V. Pejčev and B.
Marinković
Proc. XXI ICPEAC, Sendai, Japan,
1999, Abstracts of Contributed Papers,
p. 183
“Absolute cross sections for electron impact
ionization and dissociation of N2+ molecular ion”
D. Belić, J.
Jureta, et. al.
Proc. XXI ICPEAC,
“Electron impact dissociation of CO2+ to C+
and O+”
P. Defrance, E. Bahati, H. H. Cherkani and J. Jureta
Proc. XXI ICPEAC, Sendai, Japan, 1999,
Abstracts of Contributed Papers, p.
376 – MO097
"Electron Excitation of Argon: 4s'[1/2]1,
4p[1/2]1 and 4p'[1/2]0"
D. Filipović, V. Pejčev, B.
Marinković and L. Vušković
Program 52nd Annual Gaseous Electronics
Conference, Norfolk, VA, USA, 1999. Bull.
Am. Phys. Soc. 44 No.4, p.44 Abstract IWP3 15
"Electron impact excitation of argon: II. The
lowest resonance 4s'[3/2]1 and metastable 4s[3/2]2 and
4s'[1/2]0 states"
D. M. Filipović, B.
Marinković, V. Pejčev and L. Vušković
Program of the 2000 Meeting of the Division of
Atomic, Molecular, and Optical Physics (DAMOP Meeting), Storrs, Connecticut,
USA, 2000. Bull. Am. Phys. Soc. 45 No.3, p.72 Abstract L9 49
“Absorbing
molecule real excitation level during the multiphoton processes in gas
mixtures”
D.
D. Markušev, J. Jovanović – Kurepa and M. Terzić
Proc. 20th SPIG'2000, Zlatibor, Yugoslavia, Abstracts of Invited Lectures, Topical
Invited Lectures and Progress Reports and Contributed Papers, Eds. Z. Lj. Petrović, M. M.
Kuraica, N. Bibić and G. Malović, September 2000, p. 23 – 6
“Multiphoton
absorption in SF6 – Ar Mixtures: Differential cross section”
M.
Terzić, J. Jovanović – Kurepa and D. D. Markušev
Proc. 20th SPIG'2000, Zlatibor, Yugoslavia,
Abstracts of Invited Lectures, Topical Invited Lectures and Progress Reports
and Contributed Papers, Eds. Z. Lj.
Petrović, M. M. Kuraica, N. Bibić and G. Malović, September
2000, p. 27 – 30
“Differential
cross section minima in electron scattering by zinc atom”
B.
Predojević, D. Šević, R. Panajotović, V. Pejčev, D. M.
Filipović and B. P. Marinković
Proc. 20th SPIG'2000, Zlatibor, Yugoslavia, Abstracts of Invited Lectures, Topical
Invited Lectures and Progress Reports and Contributed Papers, Eds. Z. Lj. Petrović, M. M.
Kuraica, N. Bibić and G. Malović, September 2000, p. 35 – 8
“The
focal properties of three-element electrostatic electron lenses verified by
simulations in the SIMION program”
A.
R. Milosavljević, B. P. Marinković and M. V. Kurepa
Proc. 20th SPIG'2000, Zlatibor, Yugoslavia ,
Abstracts of Invited Lectures, Topical Invited Lectures and Progress Reports
and Contributed Papers, Eds. Z. Lj.
Petrović, M. M. Kuraica, N. Bibić and G. Malović, September
2000, p. 39 – 42
”Electron
impact excitation of O2 molecule in the energy range from 7 to 10 eV”
J.
Jureta, S. Cvejanović, D. Cvejanović, V. Bočvarski and V.
Cvjetković
Proc. 20th SPIG'2000, Zlatibor, Yugoslavia, Abstracts of Invited Lectures, Topical
Invited Lectures and Progress Reports and Contributed Papers, Eds. Z. Lj. Petrović, M. M. Kuraica,
N. Bibić and G. Malović, September 2000, p. 55 – 7
“Higher
energy dissociative electron attachment cross sections in sulfur dioxide”
M.
Kurepa, V. Pejčev and I. Čadež
Proc. 20th SPIG'2000, Zlatibor, Yugoslavia, Abstracts of Invited Lectures, Topical
Invited Lectures and Progress Reports and Contributed Papers, Eds. Z. Lj. Petrović, M. M.
Kuraica, N. Bibić and G. Malović, 2000, p. 59 – 62
“Differential
oscillator strengths for N2O in the 5 to 14 eV energy loss region”
S.
Čučković and B. P. Marinković
Proc. 20th SPIG'2000, Zlatibor, Yugoslavia, Abstracts of Invited Lectures, Topical
Invited Lectures and Progress Reports and Contributed Papers, Eds. Z. Lj. Petrović, M. M.
Kuraica, N. Bibić and G. Malović, 2000, p. 67 – 70
“Bethe-ov
dijagram eksperimentalnih rezultata rasejanja elektrona srednjih energija na
atomima IIb grupe: Zn, Cd i Hg”
B.
P. Marinković, R. Panajotović, V. Pejčev, D. Šević, S.
Čučković i D. M. Filipović
10. Kongres fizičara Jugoslavije,
Vrnjačka banja, 27 – 29.3.2000. Zbornik radova, knj.1 i 2, urednici B. Milić i
D. Markušev, Poster saopštenje, str. 67 – 70
“Bethe
– ov dijagram eksperimentalnih rezultata rasejanja elektrona srednjih energija
na atomima Ar, Kr i Xe”
D.
M. Filipović, B. Predojević, V. Pejčev, B. P. Marinković i
L. Vušković
10. Kongres fizičara Jugoslavije,
Vrnjačka banja, 27 – 29.3.2000. Zbornik radova, knj.1 i 2, urednici B. Milić i
D. Markušev, Poster saopštenje, str. 71 – 4
“Dinamika
multifotonskog pobudjivanja: Generalizovani model dva vezana nivoa”
D.
D. Markušev, J. Jovanović – Kurepa i M. Terzić
10. Kongres fizičara Jugoslavije,
Vrnjačka banja, 27 – 29.3.2000. Zbornik radova, knj.1 i 2, urednici B. Milić i
D. Markušev, Poster saopštenje, str. 83 – 6
“Određivanje
apsorpcionih preseka za SF6 molekul fotoakustičkom saturacionom
spektroskopijom”
M.
Terzić, J. Jovanović – Kurepa i D. D. Markušev
10. Kongres fizičara Jugoslavije,
Vrnjačka banja, 27 – 29.3.2000. Zbornik radova, knj.1 i 2, urednici B. Milić i
D. Markušev, Poster saopštenje, str. 87 – 90
“Fotoakustička
analiza V – T relaksacije molekula SF6 u smesi SF6+Ar”
D.
D. Markušev, J. Jovanović– Kurepa i M. Terzić
10. Kongres fizičara Jugoslavije,
Vrnjačka banja, 27 – 29.3.2000. Zbornik radova, knj.1 i 2, urednici B. Milić i
D. Markušev, Poster saopštenje, str. 91 – 4
“Korelacija
promena koncentracije negativnih jona i vlažnosti vazduha za vreme
pomračenja Sunca 1999. godine”
J.
Šekarić, B. P. Marinković i D. M. Filipović
10. Kongres fizičara Jugoslavije,
Vrnjačka banja, 27 – 29.3.2000. Zbornik radova, knj.1 i 2, urednici B. Milić i
D. Markušev, Poster saopštenje, str. 95 – 8
“Optimizacija
osobina magnetskog polja trohoidalnog elektronskog monohromatora”
D.
Šević i B. Marinković
10.
Kongres fizičara Jugoslavije, Vrnjačka banja, 27 – 29.3.2000. Zbornik
radova, knj.1 i 2, urednici B. Milić i D. Markušev, Poster saopštenje,
str. 99 – 102
“Optimizacija
dvostrukog cilindričnog ogledalskog analizatora”
A.
Milosavljević, B. Marinković, I. Čadež i M. Kurepa
10. Kongres fizičara Jugoslavije, Vrnjačka
banja, 27 – 29.3.2000. Zbornik radova, knj.1 i 2, urednici B. Milić i D. Markušev, Poster
saopštenje, str. 103 – 6
“Logički
model informacionog sistema u atomskoj fizici sudara”
M.
Bilbija, B. P. Marinković, V. Bočvarski, V. Cvjetković i V.
Nikolić
10. Kongres fizičara Jugoslavije,
Vrnjačka banja, 27 – 29.3.2000. Zbornik radova, knj.1 i 2, urednici B. Milić i
D. Markušev, Poster saopštenje, str. 131 – 4
“Merenje
preseka za pobudjivanje autojonizacionih stanja atoma metala udarom elektrona”
B.
Predojević, B. P. Marinković, D. Šević, V. Pejčev, D. M.
Filipović i S. Čučković
CD
zbornik radova II Kongres metrologa Jugoslavije, Novi Sad, 2000, saopštenje
040, str. 1 – 7
“Merenje
ugaonih raspodela elektrona i jona u eksperimentima sudara elektrona sa atomima
i molekulima”
A.
Milosavljević, B. P. Marinković, D. Šević, S. Madžunkov, I.
Čadež i M. Kurepa
CD
zbornik radova II Kongres metrologa Jugoslavije, Novi Sad, 2000. saopštenje
043, str. 1 – 8
“Fazzy
median filter adapted for fitting the measured spectra in scattering
experiments”
D.
Šević, R. Panajotović, B. Marinković and V. Pejčev
XLIV
konferencija ETRAN, Društvo za elektroniku, telekomunikacije, računarstvo,
automatiku i nuklearnu tehniku, Ed. V. Drndarević, B. Reljin, B.
Kovačević i N. Čukalevski, sveska 1, Sokobanja, jun 2000, str.
137 – 8
“Applicability
of generalized coupled two – level model in SF6 – CH4 gas mixture: vibration to
vibration relaxation”
D.
D. Markušev, J. Jovanović – Kurepa and M. Terzić
Proc. 4th General
Conference of the Balkan Physical Union (BPU – 4), Veliko Turnovo, Bulgaria, 2000, 4P011
“Rotational
energy transfer in gas mixtures”
D.
D. Markušev, J. Jovanović – Kurepa and M. Terzić
Proc. 4th General
Conference of the Balkan Physical Union (BPU – 4), Veliko Turnovo, Bulgaria, 2000, 4P012
“Influence
on multiphoton excitation processes in different gas mixtures”
M.
Terzić, J. Jovanović – Kurepa and D. D. Markušev
Proc. 4th General
Conference of the Balkan Physical Union (BPU – 4), Veliko Turnovo, Bulgaria, 2000, 4P029
THESES: Ph.D. and M. S.
“Efektivni preseci za jonizaciju molekula C2H2
i C3H6 elektronima energije do 1000 eV”
Goran Josifov
Fizički fakultet, Univerzitet u Beogradu (1997)
(M.S. thesis in Serbian).
“Efektivni preseci za jonizaciju molekula NO2
i COS elektronima energije do 1000 eV”
Dragan V. Lukić
Fizički fakultet, Univerzitet u Beogradu (1997)
(M.S. thesis in Serbian).
“Energijska i ugaona raspodela pozitivnih jona dobijenih
disocijativnom jonizacijom molekula elektronskim udarom”
Stojan M. Madžunkov
Fizički fakultet, Univerzitet u Beogradu (1998)
(M.S. thesis in Serbian).
“Rasejanje elektrona srednjih energija na atomima
IIb grupe”
Radmila P. Panajotović
Fizički fakultet, Univerzitet u Beogradu (1999)
(Ph.D. thesis in Serbian).
“Multifotonski
apsorpcioni i relaksacioni procesi molekula SF6 u prisustvu
buffer-gasova”
Dragan D. Markušev
Fizički fakultet, Univerzitet u Beogradu (1999)
(Ph.D. thesis in Serbian).