Intensities of vibration bands. IV. Carbonyl sulphide and acetylene

Abstract

The intensities of two vibrational absorption bands of carbonyl sulphide and acetylene have been measured, using the procedure involving pressure broadening of the bands by adding an inert gas. The results have been used to calculate how the dipole moment of these molecules varies during molecular vibration. The whole spectrum of carbonyl sulphide has been re-examined, and one band assigned to an isotopic molecule has been used to calculate an interaction constant in the potential energy function. The values found for ∂μ/∂r have been considered in relation to those determined recently for other molecules. The general empirical relationships between absorption intensity and total pressure of gas have been discussed.