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Issue

Sept - Dec
2008
 

Dear colleagues

The last newsletter in this year is a good opportunity to sum up our work and activities. Some of basic goals of our project are studies of fundamental processes relevant for understanding of nonequilibrium plasmas with wide range of applications from integrated circuits manufacturing and nanotechnologies to treatment of material and biomedical procedures. Work on the project by far exceeds the planned scope, taking into account research activities and a large number of publications in 2008. The Centre has also been successful in obtaining international projects and cooperation on equal terms, with basic research being done in our laboratories. As in previous years, a very successful Second International Workshop on Nonequilibrium Processes in Plasma Physics and Studies of Environment was organized with world leading lecturers in plasma physics.
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Special accomplishments
-M. Radmilovic - Radjenovic received Institute of Physics' award for scientific work
-Prof. Z. Petrovic was co-chairman of the 6th EU-Japan Symposium on Plasma Processing that took place in Okinawa in Japan
-G. Malovic was scientific comeettee chairperson of the 20th SPIG held in Novi Sad, Serbia
-COE members held 19 invited lectures at international confereces
-we have published more than 20 papers in international journals; some of these papers are listed as most frequently downloaded
-M. Šuvakov co-authored a paper published in Phys. Rev. Lett. which was marked by editor’s special recommendation and featured on the cover
-it is a great pleasure to inform you that COE will be organizer of the 20th ESCAMPIG in 2010
Details in Annual report >>>
 
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Focus on... mass spectrometry
Some of the characteristics of plasma needle obtained by using mass spectrometry are shown. Mass spectrometric measurements show significant conversion of feed gases (nitrogen and oxygen) into radicals N and O, and NO molecule which is found to be the dominant reaction product of these reactions.
Transition from unipolar to bipolar mode was observed through sudden increase in the yields of the measured species. Also, dominant species was NO radical and surprisingly, little ozone has been found.
More on mass spectrometry >>>
 
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Focus on... breakdown in micro-discharges
Paschen curve (the dependence of the breakdown voltage on the value of pd) should be valid at all gaps unless some new physics enters the critical stage of secondary electron production. The possible candidates that are expected to change the kinetics and cause the violation of the pd scaling are field emission, phase transitions in the gas at high pressures, tunnelling effects, and a few more. Applicability of the same physical set of data and phenomenology in higher current discharges is further complicated by possible nonlinearities of the system.
We have measured Paschen curves for dc microdischarges at gaps of 20, 40 and 100µm.
More on breakdown
in micro-discharges >>>
 
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Focus on... transport of positrons in gases
The plethora of kinetic effects found for electrons is enriched by a new one that is unique to positrons, the NDC for the bulk drift velocity when there is no such effect for the flux property. The minimum of the drift velocity caused by the NDC is two orders of magnitude smaller than the value without the NDC which is a difference much larger than any observed for the electrons. The effect for the drift velocity has been observed experimentally in the past in case of H2 but had not been fully understood. The explanation may now be seen that the bulk drift velocity NDC is due to the non-conservative nature of Ps formation and due to the large magnitude of its cross section. Therefore the condition is met such that the non-conservative term in the definition of the bulk drift velocity begins to dominate and induce the NDC even without proper conditions being met for the flux drift velocity.
More on transport of positrons here and here >>>
 
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Events
Science Festival was held from 5th to 7th December in Belgrade. Members of our group took an active role in this festival by giving an experimental presentations for curious public from 7 to 77. They were able to come and ask, look, listen, feel, smell… the science.
Read at the Festival's website >>>
 
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Holiday Greetings
All members of Centre for Nonequlibrium Processes wish you happy holidays and successful next year!

If you need any additional information regarding our work or you would like to book an appointment please click here.
Latest news
December 2008
Student Aleksandar Bojarov has won the award for the best bachelor's thesis at the Faculty of Electrical Engineering University of Belgrade, which is given by the Alumni associatrion of the Faculty of electrical engineering. The prize is a trip to the west coast of USA and visit to several companies in the bay area. Aleksandar has completed his BEng thesis under guidance of Marija Radmilovic-Radjenovic and Prof. Zoran Petrovic on PIC modeling of two frequency plasmas and is continuing his work on master's thesis within our project.

Prof. Rob Robson and Dr Ronald White from James Cook University, Townsville, Australia visited COE.

Seminars:
Prof. Rob Robson: Introductory transport theory for charged particles in gases
Dr Ronald White: Towards kinetic theory in soft-condensed matter
Read more >>>
November 2008
Prof. Zoran Petrovic participated at the 50th Annual Meeting of the Division of Plasma Physics in Dallas, Texas
Read more >>>

A BSEC (Black Sea Economic Cooperation) project ‘Revitalization of urban ecosystems through vascular plants: assessment of technogenic pollution impact' was signed.
Read more >>>

Prof. Eiliv Steinnes from Norwegian University of Science and Technology visited COE.
Read more >>>

Seminars:
Prof. Eiliv Steinnes: Distribution and fate of metals supplied to Norway by long-range atmospheric transport
Sasa Lazovic: Langmuir probes
Read more >>>
New Books! New Books!

Proceedings of the 5th EU-Japan Symposium on Plasma Processing, Belgrade, Serbia, 2007
Read more >>>

Proceedings of the 24th Summer School and International Symposium on the Physics of Ionized Gases, Novi Sad, Serbia, 2008
Read more >>>
Oktober 2008
Members of the Laboratory for Gaseous Electronic held oral presentations and invited lecture at the 61st Annual Gaseous Electronics Conference in Dallas, Texas.
Read more >>>

Prof. Zoran Petrovic gave active contribution to the 9th Asia-Pacific Conference on Plasma Science and Technology and 21st Symposium on Plasma Science for Materials held in Huangshan, China.
Read more >>>

Dejan Maletic, Srdjan Marjanovic and Marija Savic are new PhD students in LGE.

Seminars:
Nikola Skoro: Applications of microdischarges
Marija Radmilovic-Radjenovic: Atmospheric pressure discharges
Read more >>>
September 2008
Prof. Paul Maguire from University of Ulster, Jordanstown, Nothern Ireland held lecture 'Carbon nanotubes for Field Emission and Biosensors and other applications'.
Read more >>>

COE staff participated at the YUCOMAT 2008 in Herceg Novi, Montenegro.
Read more >>>

LGE members took part at International conference on gas discharges and their applications in Cardiff, UK.
Read more >>>

Nevena Puac held invited lecture at the Second Central European Symposium on Plasma Chemistry (CESPC) in Brno, Czech Republic.
Read more >>>

Prof. Zoran Petrovic participated at the International school on condensed matter physics in Sofia, Bulgaria.
Read more >>>
FP6 Project, IPB-CNP-026328, Centre for Non Equlibrium Processes, Institute of Physics, Pregrevica 118, 11000 Belgrade, Serbia
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December 2008
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