The first peak (0-0 transition) of the singlet-triplet delayed fluorescence excitation spectrum in pyrene has been investigated in polarized light. The b-polarized transition is found to be at higher energy than the a-polarized transition by a Davydov splitting of 2.4 ±{} 0.6 cm^-1. An expression for the energy bands ε(→k) is derived and related to the Davydov splitting. Transport properties of the triplet excitons have been evaluated and indicate that the diffusion of triplet excitons in pyrene is due more to a hopping process than to coherent band motion.
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Arnold et al. (1971) studied this question.
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