Diffusion-mediated exciton processes in molecular crystals: Comment on the magnetic field dependence of fission and fusion

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Abstract
It is shown in a kinematic analysis based on Suna's theory of diffusion-mediated triplet exciton-exciton annihilation that the rate constants for triplet exciton fusion (annihilation) and singlet exciton fission have the same magnetic field dependence. The relation between Suna's theory and Noyes' stochastic theory of diffusion-mediated chemical reactions is briefly discussed.