Vibrational relaxation in highly excited small polyatomics

Anatoliy A. Kosterev; A. A. Makarov; Alexander L. Malinovsky; Evgeny A. Ryabov

doi:10.1117/12.242149

10 June 1996 Vibrational relaxation in highly excited small polyatomics

Anatoliy A. Kosterev, A. A. Makarov, Alexander L. Malinovsky, Evgeny A. Ryabov

Proceedings Volume 2802, Laser Chemistry, Biophysics, and Biomedicine; (1996) https://doi.org/10.1117/12.242149
Event: International Conference on Coherent and Nonlinear Optics, 1995, St. Petersburg, Russian Federation

Abstract

Time-resolved Raman probing technique is used to investigate the collisional relaxation of high-laying C-H vibrations in CHF₃ and CHF₂Cl molecules. The relaxation rates both in collisions with parent molecules and a number of buffer gases were measured. The rate values were found to be abnormally fast. The relaxation is faster than single collision in parent gas and requires a few (3 - 8) collisions for nonpolar gases. For polar gases the relaxation is still faster. The conclusion is made that observed ultrafast relaxation of C-H modes is caused by energy transfer from excited `bright' state to nearby `dark' ones. The theoretical model of this process along with the numerical estimations is presented.

Citation Download Citation

Anatoliy A. Kosterev, A. A. Makarov, Alexander L. Malinovsky, and Evgeny A. Ryabov "Vibrational relaxation in highly excited small polyatomics", Proc. SPIE 2802, Laser Chemistry, Biophysics, and Biomedicine, (10 June 1996); https://doi.org/10.1117/12.242149

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