Abstract
The effect of stimulated-emission pumping (SEP) on the two-step laser excitation (TSLE) fluorescence of 3-hydroxyflavone in 3-methylpentane solution has been investigated. The results presented contradict the idea of a long-lived ground-state tautomer as a species responsible for TSLE fluorescence. An alternative mechanism involving the triplet-triplet absorption followed by the excited triplet-singlet intersystem crossing is discussed.
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