Couplings between inter- and intramolecular vibrations have been investigated. In normal-mode calculations a program has been used which allows all possible couplings between molecular and crystal vibrational modes. Several low-frequency molecular modes coupled to lattice vibrations have been isolated. A complete assignment of the phenanthrene crystal spectrum is presented and the intermode mixing occurring in the region from 1550 to 1250 cm−1 is discussed.
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Godec et al. (1976) studied this question.
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