Abstract
Time resolved fluorescence studies of four organic molecules in solution show that, contrary to an earlier report, the relaxed fluorescent S 1 states are formed within 10 ps of excitation even when excitation is to higher states. Fluorescence lifetimes for fluorescein and its halogen substituted derivatives vary over a factor of 40 owing to enhanced intersystem crossing. Measured radiative lifetimes agree with those calculated from integrated absorption intensities and are relatively constant.
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