Using Wilson's GF‐matrix method as modified by Higgs for infinite helical polymers, dispersion curves and the frequency distribution function have been calculated for poly‐ L ‐proline II chain. Infrared spectrum is obtained and a Urey‐Bradley force field, which provides best fit with the observed frequencies, is evaluated. The result are discussed from the viewpoint of the conformational characteristics of forms I and II.
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Gupta et al. (1973) studied this question.
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