Problems in the description of the intensities of electronic spectra of diatomic molecules in the adiabatic approximation

Details Problems in the description of the intensities of electronic spectra of diatomic molecules in the adiabatic approximation Problems in the description of the intensities of electronic spectra of diatomic molecules in the adiabatic approximation

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983svphu.140...75k&link_type=abstract

(Uspekhi Fizicheskikh Nauk, vol. 140, May 1983, p. 75-96) Soviet Physics - Uspekhi (ISSN 0038-5670), vol. 26, May 1983, p. 425-4

Physics

Born-Oppenheimer Approximation, Diatomic Molecules, Electronic Spectra, Franck-Condon Principle, Molecular Spectra, Spectral Energy Distribution, Adiabatic Conditions, Electron Transitions, Molecular Oscillations, Molecular Rotation, Transition Probabilities

Scientific paper

The current state of research on the radiative parameters of diatomic molecules is reviewed, and the problems that arise in the reliable quantitative description of intensity distributions in molecular spectra are discussed. One solution for the description of intensity distributions is the use of the adiabatic Born-Oppenheimer model, with the introduction of appropriate corrections for the electron-vibration and vibration-rotation interactions. The effect of these interactions on Franck-Condon factors is analyzed; it was determined that the effect of vibration-rotation interaction on these factors is negligible for molecular systems with values of the parameter epsilon less than 0.01 A; that special analyses are essential for systems with epsilon greater than 0.01 A; and that Franck-Condon factors of molecular systems with epsilon greater than 1 A vary substantially with increasing quantum number. Areas of application of radiative parameters include molecular spectroscopy, astrophysics, photochemistry of planetary atmospheres, plasma diagnostics, and nonequilibrium kinetics of chemical reactions in the gaseous phase.

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