SVIBOR - Project code: 1-03-051

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr

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Project code: 1-03-051


COLLISIONAL PROCESSES IN ALKALI METAL VAPOURS AND PLASMAS


Main researcher: VADLA, ČEDOMIL (51324)



Assistants
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


  1. 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

  2. Name of project: NIST (USA) JF-92 Atomic processes in low temperature plasma
    Name of institution: NIST (USA)
    City: Washington DC, USA


COOPERATION - INSTITUTIONS


  1. 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

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Last update: 09/13/95
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