Radiative lifetimes and electronic state quenching of CH2CHO(B2A")

Katherine I. Barnhard; Min He; Brad R. Weiner

doi:10.1117/12.220837

18 September 1995 Radiative lifetimes and electronic state quenching of CH₂CHO(B²A")

Katherine I. Barnhard, Min He, Brad R. Weiner

Proceedings Volume 2548, Laser Techniques for State-Selected and State-to-State Chemistry III; (1995) https://doi.org/10.1117/12.220837
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Vibronic state specific radiative lifetimes and rate constants for electronic quenching are reported for four different vibrational modes of CH₂CHO(B²A'). Vinoxy radicals are produced in the ground state by 193 nm excimer laser photolysis of methyl vinyl ether, and irradiated between 332 and 348 nm to generate the second excited state. Bimolecular quenching rate constants are determined in the presence of twelve collision partners: He, Ar, N₂, O₂, CO, H₂, HCl, N₂O, CO₂, C₂H₄, CH₃OCH equals CH₂ and SF₆. Radiative lifetimes are found to vary from 98 plus or minus 10 to 154 plus or minus 18 ns, depending on the vibronic level. Some possible mechanisms for lifetime shortening and collisional quenching are discussed.

Citation Download Citation

Katherine I. Barnhard, Min He, and Brad R. Weiner "Radiative lifetimes and electronic state quenching of CH₂CHO(B²A")", Proc. SPIE 2548, Laser Techniques for State-Selected and State-to-State Chemistry III, (18 September 1995); https://doi.org/10.1117/12.220837

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