Molecular Vibrations of Low Temperature Crystal of CO

Abstract

A method is presented for finding the frequency distributions of lattice vibrations of the molecular crystals. The method is applied to solid carbon monoxide at low temperatures, making use of the observed far-infrared frequencies to check some of the molecular interaction constants, and frequency distributions are calculated. The values of heat capacity at low temperatures are evaluated using the calculated frequency distributions, and are compared with experimental data. The result shows that the treatment may be useful in discussing molecular vibrations in the lattice at low temperatures.