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Time-dependent transport of triplet excitons in amorphous benzophenone has been investigated in the low-temperature range down to 6 K. The data exhibit some remarkable features associated with the freezing-in of excitations in energy-disordered glasses. The relaxation process is investigated and explained using Monte Carlo simulations and analytical random-walk techniques. The inadequacy of mean-field type methods is demonstrated for the low-temperature domain, where exact averaging techniques can be applied.
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Richert et al. (1989) studied this question.
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