The dispersion curves for beta(2) sheet form of poly(L-glutamic acid)
(PLG) are reported along with full normal coordinate analysis. Several
earlier assignments have been revised. Characteristic features of the
dispersion curves, such as repulsion, exchange of character etc., are
discussed. Separate contributions to the heat capacity due to purely
skeletal, pure side chain, and mix-modes have also been calculated via
density-of-states. It is found that the maximum contribution comes fr
om the mixed modes and minimum from the pure backbone modes.