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Proceedings Paper

Collisional relaxation of vibrationally excited complex molecules following laser excitation: effect of supercollisions
Author(s): G. A. Zalesskaya; D. L. Yakovlev; E. G. Sambor; D. I. Baranovsky
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Paper Abstract

Intensities and decay rates of delayed luminescence (DL) initiated by a pulse of N2 laser or CO2 laser were employed to probe collisional relaxation of complex molecules (benzophenone -- C13H10O, acetophenone -- C8H8O, anthraquinone -- C14H8O2) diluted with bath gases: Ar, C2H4, SF6, C5H12, CCl4. It was shown that time resolution about 10-8 sec permit one to divide the V-V and V-T processes for such large and complex molecules, the relaxation occurs in two stages. Upper levels relax through V-V transfer, which completes after several collisions. The collisional efficiencies of V-V process had the values typical for supercollision. The average energies transferred per collision, <(Delta) E>, well correlate with predictions of the simple ergodic collision theory of intermolecular energy transfer. The majority of energy transfer collisions involve V-T/R transfer of relatively small energies. The CO2 laser excitation method to initiate the DL allowed to obtain only V-T CET quantities because of lower time resolution.

Paper Details

Date Published: 5 February 1999
PDF: 7 pages
Proc. SPIE 3732, ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, (5 February 1999); doi: 10.1117/12.340023
Show Author Affiliations
G. A. Zalesskaya, Institute of Molecular and Atomic Physics (Belarus)
D. L. Yakovlev, Institute of Molecular and Atomic Physics (Belarus)
E. G. Sambor, Institute of Molecular and Atomic Physics (Belarus)
D. I. Baranovsky, Institute of Molecular and Atomic Physics (Belarus)


Published in SPIE Proceedings Vol. 3732:
ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine

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