Collisional relaxation of vibrationally excited complex molecules following laser excitation: effect of supercollisions

G. A. Zalesskaya; D. L. Yakovlev; E. G. Sambor; D. I. Baranovsky

doi:10.1117/12.340023

5 February 1999 Collisional relaxation of vibrationally excited complex molecules following laser excitation: effect of supercollisions

G. A. Zalesskaya, D. L. Yakovlev, E. G. Sambor, D. I. Baranovsky

Author Affiliations +

Proceedings Volume 3732, ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine; (1999) https://doi.org/10.1117/12.340023
Event: ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, 1998, Moscow, Russian Federation

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.

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G. A. Zalesskaya, D. L. Yakovlev, E. G. Sambor, and D. I. Baranovsky "Collisional relaxation of vibrationally excited complex molecules following laser excitation: effect of supercollisions", Proc. SPIE 3732, ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, (5 February 1999); https://doi.org/10.1117/12.340023

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KEYWORDS

Molecules

Carbon dioxide lasers

Energy transfer

Molecular lasers

Gases

Luminescence

Information technology

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