Abstract
It is shown that the EPR linewidth spectrum of triplet excitons in molecular crystals can be severely distorted by weak orientational disorder. The demonstration employs a one-parameter correction procedure based on the assumption that the angular dependence of excess width is directly proportional to the angular gradient of the resonant field. Application to the discrepant data of Haarer and Wolf brings them into agreement with theory and with more recent experiments. A phenomenological model of the disorder is used to interpret the distortion parameter. These results suggest the potential value of exciton EPR as a probe of structural imperfections in molecular crystals.
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