Abstract
The triplet lifetime of aromatic hydrocarbons in liquid solution is relatively short compared with the lifetime in a rigid solution. Until now this difference has been explained by an impurity quenching mechanism. An alternative explanation is given, assuming quenching of a triplet molecule by a singlet ground state molecule of the same kind, resulting in the formation of a triplet excimer. A kinetic analysis of this mechanism is given. The results are discussed and compared with experiments.
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