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Spectra of Diatomic Molecules

#0745


Investigation of Electron-Vibrational-Rotational Spectra of Diatomic Molecules

Tech Area / Field

  • PHY-OPL/Optics and Lasers/Physics

Status
3 Approved without Funding

Registration date
11.09.1996

Leading Institute
FIAN Lebedev, Russia, Moscow

Supporting institutes

  • VNIIEF, Russia, N. Novgorod reg., Sarov

Collaborators

  • Universiteit Amsterdam, The Netherlands, Amsterdam\nTechnishe Universiteit Eindhoven / Department of Physics, The Netherlands, Eindhoven\nInstituto Superior Técnico, Portugal, Lisbon

Project summary

Modern physics, chemistry and related fields of science need the knowledge of basic spectroscopic constants of molecules. However conventional methods for determination theory and high cost complicate these parameters by experiments even for diatomic molecules. About ten years ago for the first time it were published results of FIAN's investigators where the experimental data on vibration constants (we) of the basic state diatomic molecules consisting of s- and p- unfilled shells atoms had been analyzed. The offered project is devoted, in basic, to revealing of periodic properties of molecules. This new very perspective branch only begins to develop. Results of these researches will allow predicting parameters and properties of diatomic molecules without certain realization of complex and expensive experiments and computer accounts.

The basis of the project is an experimental and theoretical substantiation of New Fundamental Parameter, receiving the name "Molecular Affinity". At the present stage its numerical value for certain atom and law of its variation from atom to atom is determined. This parameter:


- allows to approach to new representations about a nature of atomic-molecular bonds in gaseous, liquid and solid states;
- shows a uniform nature "of various types" of chemical bonds;
- has helped to establish analytical relations between all kinds of internal energy of molecules, considered earlier independent;
- for the first time has allowed establishing relations between electrical and optical properties of atoms and molecules;
- has allowed calculating with a high degree of accuracy vibration and rotational constants of all probable diatomic molecules, including superheavy chemical elements, not yet observed in a nature.

Now impossible to foresee all probable consequence of these revealed relations.

Technical Approach and Methodology

The Project realization is assumed as following:


1. To develop the technique of obtaining excited electronic states of diatomic molecules in gas discharges (RF, MW etc.)
2. To carry out the investigation of excited electronic states of diatomic molecules (including excimer and exciplex ones) by single- and multiphoton laser pump processes.
3. To carry out spectroscopic measurements of electron-vibration-rotational transitions between high-excited states of diatomic molecules and their ions.
4. To perform theoretical calculations of periodical properties of molecules for determining general regularity of their spectroscopic constants on the basis of experimental results.
5. To develop software for analysis of optical spectra and obtaining spectroscopic constants of diatomic molecules.

Anticipated Results

New atom parameter opens great perspective in the field of technical applications. The results of the project will be used for revelation of variation law of a "molecular affinity" for electronic exited states of molecules, fast search of active laser media, for example, for multicolor (dimerous) lasers. These lasers allow receiving simultaneously tens and hundred of laser beams of various color shades on the whole visible area of a spectrum from one laser media. On their basis:


- new generation (tunable on lengths of waves) laser projector microscopes will be created;
- manufacture of the whole class of converters of laser radiation for transformation of given color of a laser beam into other (essentially by improving functional parameters of already existing industrial laser devices and not modifying the "know-how" last ones) will be begun; capacities of compact discs could be increased in tens and hundred of times;
- unique multicolor laser installations for light effects in show, advertising business, in household design could be created.

On the other hand, on the basis of selected dimerous media new generation of illuminating dimeric lamps with extremely high light efficiency and "sun-like" spectrum will be created. Only in USA such elaboration will allow to save a few billions of dollars annually.

Offered researches will allow to intensify development of the following important branches of applied spectroscopy as:


- development of quantitative methods of actinometry of technological plasma processes in microtechnology, gas-synthesis of new materials, optical control of technological processes, in particular, it is possible to work out the methods of the quantitative spatial resolved detection of the concentration of important radicals in active plasma (for example, concentration of atoms H during synthesis of diamond films, atoms of chlorine and fluorine in reactors of a plasma chemical etching and etc.);
- development of new mercuryless gas sources of light;
- search of more effective gas mixtures for plasma displays;
- development of high effective non-coherent UV and visible sources of radiation for use in photo enhanced chemical technologies (bactericidal lamp, photo-enhanced deposition of films, photolithography and etc.)


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