Quantitative Infrared Intensity Measurements. I. Carbon Monoxide Pressurized with Infrared-Inactive Gases

Abstract

Quantitative infrared intensity measurements on CO pressurized with H₂, He, A, O₂, and N₂ for total pressures up to 700 psia have been carried out. The values of integrated absorption for the fundamental and first overtone of CO have been found to be 237 cm⁻² atmos⁻¹ and 1.64 cm⁻² atmos⁻¹, respectively. The numerical values of integrated absorption were obtained by using an indirect method for the interpretation of experimental data, similar to the extrapolation technique of Wilson and Wells. The experimental data obtained at very large values of the total pressure should yield correctly the numerical values of the spectral absorption coefficients. This statement is supported by the fact that the integral over the spectral absorption coefficients at a total pressure of 700 psia yields values for the integrated absorption of fundamental and first overtone of CO which are in excellent agreement with results obtained by indirect methods.