Correlations for Absorption by Methane and Carbon Dioxide Gases

Correlations of band absorption based on the Goody model for average spectral absorptivity and an arbitrary band structure model are presented for the 7.6-μ and 3.3-μ methane bands and the 15-μ, 4.3-μ, and 2.7-μ carbon dioxide bands. The correlation gives band absorption as a smooth function of path length, pressure, and temperature. Correlation parameters were obtained from data at temperatures of 300°K, 555°K, and 833°K in the case of CH4 and 300°K, 555°K, 833°K, 1110°K, and 1390°K in the case of CO2. Comparisons of the correlations with data of various investigators are presented.