Abstract
The quantum mechanics of triplet excitons in molecular crystals is used to determine the effect of a finite excitation transfer interaction between interchange equivalent molecules on the exciton dispersion and density of states and on the zero field spectral density functions for intraband branch—branch transitions. Four cases of specific interest M > D,E; M ≈ D,E; M < D,E; and M ≈ 0 arise where M is the excitation transfer integral and D and E are the molecular magnetic fine structur parameters. Of these, only M > D,E and M ≈ 0 have been considered previously. The effects are illustrated for parameters of the 1,2,4,5-tetrachlorobenzene crystal.
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