COLLISIONAL PROCESSES IN ALKALI METAL VAPOURS AND PLASMAS
Main researcher
: VADLA, ČEDOMIL (51324) Assistants
VEŽA, DAMIR (66334)
BEUC, ROBERT (50992)
HORVATIĆ, VLASTA (87135)
KNEZOVIĆ, STIPE (3216)
MOVRE, MLADEN (32514)
Type of research: basic Duration from: 01/01/91. to 12/31/93. Papers on project (total): 28
Papers on project quoted in Current Contents: 19
Institution name: Institut za fiziku, Zagreb (35) Department/Institute: Atomic and molecular physics Address: Bijenička cesta 46 City: 10000 - Zagreb, Croatia
Communication
Phone: +385 (01)271-211
Fax: +385 (01)271-544
E-mail: vadla&ifs.hr
Summary: The investigations are both experimentally and
theoretically devoted to the collisional phenomena in gases and low
temperature plasmas. Research is focused on the collisional processes
between atoms and molecules producing the broadening of the spectral lines
and excitation energy transfer within one of the involved particle or
between the partners in collision. The experiments involve use of the
several techniques such as laser fluorescence and absorption,
Doppler-free as well as Dopler-limited two-photon spectroscopy, emission
and optogalvanic detection, etc. These investigations enable the
determination of the nature of the mentioned collisional processes, the
interaction potentials between considered particles and also the
evaluation of the characteristic constants - oscillator strengths, line
broadening constants, cross sections for the particular reactions. All
investigated phenomena have been given accompanying theoretical
considerations, analytical as well as numerical calculations and
modeling.
Keywords: atomic and molecular physics, laser spectroscopy, line broadening, excitation energy transfer, atomic collisions
Research goals: The understanding of the nature of the collisional
processes between the homonuclear or heteronuclear atoms is of basic
interest in atomic and molecular physics. Especially important are the
non-adiabatic collisions leading to the excitation energy transfer. The
existing experimental data about these processes are incomplete even for
the simplest diatomic systems, e.g. alkali systems, and there is also the
strong discrepancy between the experimental and theoretical results in
this field. The main goal of this project is the determination of the
cross sections for the excitation energy transfer in homonuclear and
heteronuclear alkali systems and the development of the theoretical models
which enable the description of the processes under consideration. Since
these processes reflect itself also in the shapes of the corresponding
atomic lines, in the framework of this project the line broadening
investigations are performed.
COOPERATION - PROJECTS
Name of project
: Ni 185/17-1 Energietransfer Name of institution: Deutsche Forschungsgemeinschaft (BRD) via
Institut fur Spektrochemie und Angewandte Spektroskopie (ISAS) City: 4600 - Dortmund, SR Njemačka
Name of project
: NIST (USA) JF-92 Atomic processes in low
temperature plasma Name of institution: NIST (USA) City: Washington DC, USA
COOPERATION - INSTITUTIONS
Name of institution
: Institut fur Spektrochemie und Angewandte
Spektroskopie (ISAS) Type of institution: University/Faculty Type of cooperation: Joint project City: 4600 - Dortmund, SR Njemačka Other information about the project.