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Phonon dispersion curves and normal coordinate analysis of α‐poly‐ L ‐alanine
Author(s) -
Fanconi Bruno,
Small Enoch W.,
Peticolas W. L.
Publication year - 1971
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.360100804
Subject(s) - chemistry , dispersion (optics) , phonon , deuterium , molecular physics , inelastic neutron scattering , alanine , normal mode , distribution (mathematics) , inelastic scattering , nuclear magnetic resonance , atomic physics , scattering , condensed matter physics , vibration , physics , optics , mathematical analysis , quantum mechanics , amino acid , biochemistry , mathematics
The vibrational frequencies of α‐helical poly‐ L ‐alanine and its N ‐deuterated analog have been assigned by normal coordinate analyses. The phonon dispersion curves and frequency distribution of α‐poly‐ L ‐alanine have been calculated by using a model which includes hydrogen bonding. The frequency distribution was used to interpret the inelastic neutron scattering data and to calculate the heat capacity. The low‐frequency chain modes involving accordian‐like motions of the whole helix have been calculated and their dispersion investigated by means of a simplified model.