SVIBOR - Project code: 1-03-053

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: 1-03-053


DIAGNOSTICS OF THE ATOMIC SYSTEMS AND PHYSICS OF THE COHERENT FIELDS


Main researcher: VUJNOVIĆ, VLADIS (53655)



Assistants
Type of research: basic
Duration from: 01/01/91. to 12/31/95.

Papers on project (total): 51
Papers on project quoted in Current Contents: 10
Institution name: Institut za fiziku, Zagreb (35)
Department/Institute: Department of the physics of ionized gases
Address: Bijenička c.46
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0)1 271 211
Fax: 385 (0)1 421 156
E-mail: VVUJNOVIC OLIMP.IRB.HR

Summary: Object of study is the relationship between basic physical parameters and spatial structure of the specific light source. By using spectroscopic techniques applicable for the source of general optical thickness, diagnosis was performed of the local conditions in an electric arc discharge, and mehcanisms were studied which lead to the observed spectrum. By using numerically sinthesyzed spectra, broadening mechanisms of mercury spectral lines were investigated. The atomic transition probabilities were critically compiled for the NeII, ArII, HgI and the same was started for the Al I,II. The vacuum arc initiation was analysed, processes which lead to the spectrum at the Balmer limit, and profiles of hydrogen and helium lines. The interferomeric methods of phase multiplication in the DC corona discharge were investigated. Using the extended optical correlator system, the properties of the quasi phase-only matched spatial filters were analysed. A numerical model was developed and the condition established for the inverse matched spatial filtering. A measure was introduced giving an overall estimate of the feasibility of filters. Methods of optoelectronic pattern recognition were implemented for the characterization of the cuneiform inscription signs of the Middle Babylonian epoch.

Keywords: Atomic spectroscopy, atomic data, discharge plasma, light source, holographic interferometry, profilometry, optical correlation, matched filtering

Research goals: To measure, collect and analyse the atomic parameters of different elements in neutral and ionized states: the lifetimes, oscillator strengths, halfwidths, absorption coefficients and other accessible quantities; to search for systematic trends and comparisons with theoretical approaches. Aim is to apply diagnostic methods in order to asses the spatial behavior of temperature and particle concentrations, and to take into account the plasma optical density. Results are expected in the form of new or improved data and regularities, in refined approach and numerical procedures. Further intention is to analize spatial structure of bodies by methods of coherent optics. In spectroholography, the spatial resolution improvement of primary fringes, the possibility of analysing them in real time and with only single exposure. The development of the numerical methods for the analysis of the basic measures involved in the definition of complex filters, and the output correlation signal behaviour. The development of a complex optoelectronical processor for the recognition and identification of patterns, based on the original architecture of the extended optical correlator system. The application of the developed methods and devices onto characterization of some patterns of interest. Spectroholography should be applied to study structure of electric discharges. Collection of atomic parameters should be extended in order to satisfy astrophysical interests, especially for the stellar atmospheres.


COOPERATION - PROJECTS


  1. Name of project: JF PN 929 ATOMIC PROCESSES IN LOW-TEMPERATURE PLASMAS
    Name of institution: NATIONAL INSTITUTE FOR SCIENCE AND TECHNOLOGY
    City: WASHINGTON, U.S.A.

  2. Name of project: ODREĐIVANJE ATOMSKIH KONSTANTI I BRZINA REAKCIJA PRI POBUĐIVANJU ATOMA I MOLEKULA (DETERMINATION OF ATOMIC PARAMETERS AND RATE COEFFICIENTS OF EXCITED ATOMS AND MOLECULES)
    Name of institution: FIZIČESKIJ FAKUL'TET, UNIVERSITET ST.PETERBURG (FIZIČKI FAKULTET SVEUČILIŠTA U ST.PETERBURGU)
    City: ST.PETERBURG, ROSSIJA (RUSIJA)

  3. Name of project: Quantum-mechanically Complete Experiments with State-prepared Alkali Atoms
    Name of institution: Fak.f.Physik, Universitaet Bielefeld
    City: 33501 - Bielefeld, Njemačka


COOPERATION - INSTITUTIONS


  1. Name of institution: National Institute of Science and Technology
    Type of institution: University/Faculty
    Type of cooperation: Joint project
    City: WASHINGTON, U.S.A.

  2. Name of institution: Naučno issledovateljnyj institut, Fizičeskij fakuljtet, St.Peterburšskij Universitet
    Type of institution: University/Faculty
    Type of cooperation: Joint project
    City: ST.PETERBURG, ROSSIJA (RUSIJA)

  3. Name of institution: Humboldt-Universitaet zu Berlin, Inst.f.Physik, Labor f.Kohaerenzoptik
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers

  4. Name of institution: Inst.f.Experimentalphysik, Technische Universitaet Graz
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: 8010 - Graz, Austrija

  5. Name of institution: Fak.f.Physik, Universitaet Bielefeld
    Type of institution: University/Faculty
    Type of cooperation: Joint project
    City: 33501 - Bielefeld, Njemačka

  6. Name of institution: Prirodoslovno-matemati;ki fakultet Sveu;iliŠta u Zagrebu
    Type of institution: University/Faculty
    Type of cooperation: Systematic exchange of information
    City: 10000 - Zagreb, Croatia

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Last update: 10/09/95
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