Abstract
Abstract The electron spin resonance (ESR) absorption and its variation with the temperature were measured with single crystals of the anion radical salts containing the mixed cations, [(C6H5)3PCH3]1−x+ [(C6H5)3AsCH3]x+(TCNQ)2\ewdot, (0≤x≤1). The paramagnetic excited state of these salts is triplet in character, as was shown from the anisotropic zero-field splitting at low temperatures. The triplet state is not localized, but, rather, corresponds to the triplet exciton state. The exciton exchange frequency and its temperature dependence were determined by analyzing the line shapes of the ESR spectra. The exciton motion in the mixed crystal system was investigated in order to establish the character of the triplet excitons in ion radical salts.
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