State‐to‐state vibrational relaxation in 1B2u benzene‐d6 induced by low energy collisions with He, H2, N2, and Ar

Autor:	Alan E. W. Knight, Mark W. Rainbird, Brian S. Webb
Rok vydání:	1988
Předmět:	Argon Hydrogen Branching fraction General Physics and Astronomy chemistry.chemical_element Collision Fluorescence spectroscopy chemistry.chemical_compound chemistry Vibrational energy relaxation Physical and Theoretical Chemistry Atomic physics Benzene Helium
Zdroj:	The Journal of Chemical Physics. 88:2416-2428
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.454024
Popis:	Time‐resolved dispersed fluorescence spectroscopy has been used to study very low energy collision‐induced vibrational relaxation in 1B2u benzene‐d6 expanded in a supersonic free jet. Several expansion gases have been used to enable rate coefficients for vibrational relaxation to be obtained as a function of collision partner in the very low energy collision regime. Benzene‐d6 is found to undergo vibrational deactivation with each of the chosen collision partners He, H2, N2, and Ar. This study focuses on measuring state‐to‐state relaxation rate coefficients and branching ratios for vibrational relaxation from the S1 vibrational level 61 (evib =498 cm−1). Relaxation occurs to all the known S1 vibrational levels lying lower in energy than 61, namely 101 (evib =454 cm−1), 162 (evib =414 cm−1), 111 (evib =382 cm−1), 41 (evib =306 cm−1), 161 (evib =207 cm−1), and 00 (evib =0 cm−1). Two other unidentified channels also participate. Nitrogen and argon are found to be the most efficient collision partners in indu...
Databáze:	OpenAIRE
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