[institut] BioPhysLab seminar: Mike Pravica, Friday, July 14th 2023, 14:00h

[Aleksandar Krmpot]

Dear colleagues, 

You are cordially invited to the BioPhysLab seminar, which will be held
on Friday,  July 14th 2023 at 14:00 in the library reading room "Dr.
Dragan Popović" of the Institute of Physics Belgrade. The talk entitled

"Driving novel chemistry with x-rays"

will be given by Prof. dr. Mike Pravica, Professor of Physics,
Department of Physics and Astronomy, University of Nevada, Las Vegas 

The abstract of the talk:

Though x-ray induced damage has been traditionally viewed as a nuisance,
we use hard x-ray
induced photochemistry as a means to create novel synthetic pathways for
novel materials (e.g.
doped polymeric CO [1]) and novel structures of known materials (e.g.
CsO2) without the need for
catalysts or heat. Hard x-rays (>7keV) can penetrate sealed and
pressurized chambers such as in
a diamond anvil cell (DAC) and are energetically far above any
activation thresholds that may
prevent the synthesis of predicted yet undiscovered materials using
conventional chemistry (order
of eV). They can also be resonantly absorbed near the K-[1] and L-edges
of metal cations in salts to
cause electron transfer and drive chemical decomposition (and synthetic)
reactions in a very
controlled way. This method was employed to safely release molecular
fluorine _in situ_ in a DAC
at high pressure to drive chemistry at extreme conditions (via e.g. XeF2
+hν→ Xe + F2)[2] enabling the
synthesis of HgF4 at high pressure which has been predicted and possibly
observed2. This talk
will give a survey of our efforts to develop useful hard x-ray
photochemistry as a novel way to
perform unique chemistry including the effort to verify some predictions
of inner shell chemistry.

References
1. Goldberger, D., Evlyukhin, E., Cifligu, P., Wang, Y.. Pravica, M.,
Measurement of the
Energy and High-Pressure Dependence of X-ray-induced Decomposition of
Crystalline
Strontium Oxalate, Journal of Physical Chemistry A, 2017, 121, 7108-7113
.
2. Pravica, M., Schyck, S., Harris, B., Cifligu, P., Billinghurst, B.,
Fluorine chemistry at
extreme conditions: possible synthesis of HgF4. Papers in Physics 2019
11, 110001-1-5. 

Sincerely,  
-- 

dr Aleksandar J. Krmpot, naucni savetnik
BioPhysLab
Institut za fiziku, Pregrevica 118, 11080 Beograd-Zemun, SRBIJA

dr. Aleksandar J. Krmpot, research professor
BioPhysLab
Institute of Physics, Pregrevica 118, 11080 Belgrade- Zemun, SERBIA

telefon/phone:  +381 11 3713 012
mobilni/cell:   +381 64 202 65 62
e-posta/e-mail: krmpot at ipb.ac.rs
www.hemmaginero.rs [1] 
www.ipb.ac.rs [2] 
http://www.ipb.ac.rs/en/istrazivanja/laboratorije-2/laboratorija-za-biofiziku/

 

Links:
------
[1] http://www.hemmaginero.rs
[2] http://www.ipb.ac.rs
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