Abstract
Abstract S2 → S0 fluorescence quantum yields and S2 lifetimes of eight aromatic thiones in inert perfluoroalkane solutions at room temperature have been measured using picosecond laser techniques. Photostable, structurally rigid thiones undergo S2 → S1 internal conversion at rates consistent with the energy gap law of radiationless transitions. An average electronic coupling matrix element of 1.9 × 102 cm−1 is found.
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