Intensity and Line‐Width of the 15‐Micron CO2 Band, Determined by a Curve‐of‐Growth Method

The intensity of the 15 μ band of CO2 has been redetermined by a curve‐of‐growth method, utilizing simple formulas derived for the absorption coefficient of the Q branch. The value obtained is 240 cm—1 per cm at S.T.P., some 25 to 30% higher than the results of the Wilson‐Wells method. Extrapolation methods in general can lead to considerable underestimation of intensity, especially when applied to bands containing narrow Q branches.The nitrogen‐broadened half‐width at one atmosphere and 298K is 0.064 cm—1.