Abstract

The results of laboratory measurements of high-resolution infrared spectra of carbon dioxide in the region near 10 μm at several temperatures and pressures are described. Spectra of the CO₂ laser bands centered at 961 and 1064 cm⁻¹ were collected at a resolution of 0.005 cm⁻¹ with the gas at temperatures between 50 and 150°C. The self-broadened rotation–vibration line shapes were modeled using a nonlinear least-squares regression technique. Careful attention was given to the problem of base line correction. The temperature exponent of the pressure-broadening coefficient was estimated for thirty lines. The linewidths obtained previously using indirect methods compare well to data obtained in the present investigation.

© 1987 Optical Society of America

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