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Self-Broadening Effects in the Infrared Bands of Gases

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Abstract

Various techniques for measurement of the self-broadening of spectral lines of absorbing gases as compared with the line-broadening effects of nitrogen have been tested and are critically compared. Mean values of self-broadening coefficients applicable to entire absorption bands have been redetermined with improved precision for CO, CO2, N2O, CH4, and NH3; agreement with earlier results is good except for NH3. Low-resolution studies of the variation of self-broadening coefficients across absorption bands indicate that the coefficients generally have maximum values in the spectral regions where absorption is greatest; however, the coefficients for individual vibration–rotation lines determined at higher resolution do not, in general, show striking variations from line to line in a given band. Certain apparent anomalies in the results for NH3 are discussed.

© 1967 Optical Society of America

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