Abstract
The two-dimensional lattice vibrations of the extended form of polyglycine have been calculated from a five mass model of the glycine chemical repeat unit and with interchain hydrogen bond stretching. The effects of hydrogen bond bending and torsion on the lattice modes are determined using a model in which the entire chemical repeat unit is treated as a single dynamical unit. The valence force field for the latter model is found by fitting the optical frequencies determined from the five mass calculation. The density of phonon states for the two-dimensional lattice is determined for the single mass model.
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