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The normal vibrations of crystalline trans-1,4-polybutadiene have been calculated by combining interchain atom-atom potentials with the previously proposed intrachain force field. These calculations have been used to analyze the infrared and Raman spectra of an essentially all-trans urea-complex polymer. The band splittings and low-frequency lattice modes observed in these spectra are satisfactorily accounted for by the calculations.
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Hsu et al. (1975) studied this question.
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