Abstract
State-specific radiative lifetimes and electronic quenching cross sections are reported for four different vibrational modes of CH2CHO (B̃2A‘‘). Ground-state vinoxy radicals are produced by 193-nm excimer laser photolysis of CH3OCHCH2, and pumped to the B̃ state by a tunable dye laser operating between 332 and 348 nm. Fluorescence decay rates are determined in the presence of 12 collision partners: He, Ar, N2, O2, CO, H2, HCl, N2O, CO2, C2H4, CH3OCHCH2, and SF6. The measured electronic quenching cross sections vary from 0.01 to 66.5 Å2. Zero pressure radiative lifetimes are found to vary from 98 ± 10 to 154 ± 18 ns, depending on the vibrational mode. Possible mechanisms for lifetime shortening and collisional quenching are discussed.
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