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Broadening of Infrared Absorption Lines at Reduced Temperatures: Carbon Dioxide

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Abstract

An evacuated high-resolution Czerny–Turner spectrograph, which is described in this paper, has been used to determine the strengths S and self-broadening parameters γ0 for lines in the R branch of the ν3 fundamental of 12C16O2 at 298 and at 207 K. The values of γ0 at 207 K are greater than those to be expected on the basis of a fixed collision cross section σ. The approximate ratio of the measured cross sections for a given line is σ(T1)/σ(T2) = T2/T1; although this relation holds for the average of all lines measured, the cross-section ratio is greater than the temperature ratio for lines near the band center and less than the temperature ratio for lines in the wings of the band.

© 1972 Optical Society of America

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