Temperature Dependence of the Total Intensity of Difference-Band Systems: The 10-μ Band System of CO2

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Abstract
The temperature dependence of the total intensity of difference‐band systems is discussed and a general expression is given in the harmonic‐oscillator approximation for difference transitions between two nondegenerate vibrations. The results are compared with experimental measurements of the sum of the total intensities of the (ν3—ν1) and (ν3−2ν2) difference bands of CO2 (the 10‐μ band system). New data are presented at temperatures higher than previously investigated (up to 2300°K). In the temperature range studied, the main contribution to the temperature dependence comes from the Boltzmann term.