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Delayed fluorescence was detected in laser-induced fluorescence in anthracene single crystals after the laser pulse ended. The rate of decay of this fluorescence and other experimental observations was explained by assuming that the singlet state giving rise to the fluorescence is produced by a bimolecular annihilation of triplet excitons generated directly by the laser light. The lifetime and the bimolecular interaction rate constant of the triplet excitons were found to be 10 msec and 10/sup -11/ cm/sup 3/ sec-/sup 1/, respectively. (C.E.S.)
Kepler et al. (Wed,) studied this question.