Distribution of vibrational energy levels of protein molecular chains

The distributions of the quantum vibrational energy levels of the protein m olecular chain are found by the discretely nonlinear Schrodinger equation a ppropriate to protein obtained from the Davydov theory. The results calcula ted by this method are basically consistent with the experimental values. F urthermore, the energy spectra at high excited states have also been obtain ed for the molecular chain which is helpful in researching the properties o f infrared absorption and Raman scattering of the protein molecules.