Vibration--rotation interaction and intramolecular relaxation of vapors of electronically excited molecules

Journal Article · Thu Sep 01 04:00:00 EDT 1988 · Opt. Spectrosc. (Engl. Transl.); (United States)

OSTI ID:5975562

Demchuk, Y S; Vinokurov, S L; Mirumyants, S O

We have studied the influence of vibration--rotation Coriolis interaction on the processes of vibrational energy redistribution in electronically excited polyatomic molecules. The probability of a nonradiative intramolecular transition between the energy levels of molecular oscillators, active and inactive in a vibronic transition during selective excitation, is discussed. It is shown that nonradiative intramolecular transitions due to Coriolis interaction lead to a decrease of selectivity in the distribution of the excited state over the vibrational energy levels. The nature of the temperature dependence of the intramolecular redistribution of vibrational energy is established. The strength ratio of the discrete and diffuse components of the vapor fluorescence spectrum as a function of the ratio of the probabilities of spontaneous radiative and relaxation nonradiative transitions is discussed. Agreement between the theoretical and experimental data on the temperature dependence of the discrete and diffuse components of the vapor fluorescence spectra is noted.

• OSTI ID: 5975562
• Journal Information: Opt. Spectrosc. (Engl. Transl.); (United States), Journal Name: Opt. Spectrosc. (Engl. Transl.); (United States) Vol. 65:3; ISSN OPSUA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
CORIOLIS FORCE
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUORESCENCE
LUMINESCENCE
MOLECULES
POLYATOMIC MOLECULES
PROBABILITY
ROTATIONAL STATES
TEMPERATURE DEPENDENCE
VIBRATIONAL STATES