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The S sub 0 to S sub 2 Laser Photoexcitation Spectrum and Excited State Dynamics of Jet-Cooled Acetophenone.
COLORADO STATE UNIV FORT COLLINS DEPT OF CHEMISTRY
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The S2 from S0 photoexcitation spectrum of jet cooled acetophenone is presented. The observed homogeneously broadened linewidths indicate S2 lifetimes or 0.26 fs while the measured emission lifetimes range from 540 or - 30 ns for S0 O0 superscript 0 excitation to 130 or - 50 ns for S2 12 12 excitation. The dynamics revealed by the spectrum are discussed in terms of the known photochemical and photophysical rates of the excited states of acetophenone. Arguments are presented which identify the emitting state as a known dissociative triplet state of acetophenone.
APPROVED FOR PUBLIC RELEASE