Magnetic field dependence of the room temperature prompt fluorescence under high field conditions from mixed crystals of tetracene containing 2,3- benzocarbazole (BC) as guest molecules is studied both as a function of the mol fraction of BC and the orientation of the external magnetic field. Crystalline mixtures of BC in tetracene were prepared in the mol fraction range 0%–48.1%. For mol fraction x<9% BC, the angular separation between the high field pair state resonances was approximately 52°, whereas for x∼9% this separation dropped to ∼41% and remained at this value for concentrations 9.4%
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Arnold et al. (1976) studied this question.
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