Abstract

High-resolution phosphorescence—microwave double resonance (PMDR) and optically detected magnetic resonance techniques have yielded two independent measurements of the nearest-neighbor excited-state exchange matrix element in dimers of 1,2,4,5-tetrachlorobenzene. Both experiments yield a value (0.07 cm −1) smaller than the value reported for exciton systems (0.34 cm −1), indicating a strong violation of the ideal mixed crystal concept.

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