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The anisotropic proton hyperfine interactions with the electrons of the triplet state phenanthrene molecule in diphenyl single crystals at ∼ 77°K were measured by electron paramagnetic resonance spectroscopy. The distribution of spin in the triplet state phenanthrene molecule was deduced from these measurements and compared with theoretical estimates of the spin densities for triplet state phenanthrene, phenanthrene negative ion, and phenanthrene positive ion.
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Frosch et al. (1973) studied this question.
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