Abstract
AbstractThe motion of triplet excitons in molecular crystals with two inequivalent molecules per unit cell is treated as a hopping process, using the stochastic part of the Hamiltonian of the Haken‐Strobl model. The dynamics of the spin is described by the usual Hamiltonian, taking into account the fine structure interaction. Using a correlation function formalism, the line shape is calculated as a function of the frequency at fixed magnetic field and as a function of the magnetic field at fixed frequency. The relation between the eigenvalues of the correlation functions and the lineshape is discussed, and it is shown that the lineshape may be described approximately by four and two eigenvalues, if the hopping rate of the exciton is small and large, respectively.
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