The Vibrational Energy Level System of the Linear Molecule HCN

Abstract

The discovery of new rotation-vibration bands in the infrared absorption spectrum of gaseous HCN has made possible a determination of the vibrational energy level system of the normal molecule. The agreement between theory and experiment is completely satisfactory. The fundamental frequencies of the isotopic molecule ${\mathrm{H}}^{2}$CN are predicted from those found for ${\mathrm{H}}^{1}$CN.