10 June 1996 Vibrational relaxation in highly excited small polyatomics
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anatoliy A. Kosterev, A. A. Makarov, Alexander L. Malinovsky, Evgeny A. Ryabov, "Vibrational relaxation in highly excited small polyatomics", Proc. SPIE 2802, Laser Chemistry, Biophysics, and Biomedicine, (10 June 1996); doi: 10.1117/12.242149; https://doi.org/10.1117/12.242149
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