Saturation kinetics of the S0 to S2 optical transition in isolated diphenylhexatriene

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Abstract
A three level kinetic model is fitted to fluorescence intensities measured as a function of excitation intensity for the S0 to S2 transition of isolated diphenylhexatriene. Parameters derived in the fit are coupled with experimental observations to bracket the rate of energy redistribution from S2 to vibrationally excited levels of S1 and S0 to between 1010 and 4×1012 s−1. The rate of excitation, which is directly proportional to oscillator strength, is precisely determined in the fit to be 3.7×108 s−1 per μJ at the peak of our 6 ns FWHM laser pulse.

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