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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