Infrared Absorption Coefficients for Certain Pollutant Gases

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Abstract
Quantitative analysis of gas mixtures by infrared spectroscopy requires a knowledge of the absorption coefficients,: k ν − , as a function of optical path length and temperature. For the majority of pollutant gases, information is scarce or incomplete. The objective of this work was to determine absorption coefficients for CH 4 , C 2 H 4 , CO 2 , CO, SO 2 , NO 2 , NO, and H 2 S. Measurements were made at room temperature and elevated temperatures for certain wave lengths, and k ν − was determined over a very wide range of optical path length, x. The validity of the Bouguer-Beer law was confirmed for a limiting range of x, and for larger values of x, k ν − decreased and was correlated as a function of x and T.

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