The effect of collision narrowing on inhomogeneous, long-path atmospheric transmittance is discussed. The different temperature and pressure dependence of the collision narrowing and the collision broadening contributions to the absorption line shape can result in a significant change in calculated values of both the absolute and relative transmitted intensity. Illustrative calculations are presented for a narrow-band source that is resonant with selected absorption lines of CO(2) and is transmitted along a variety of atmospheric paths.
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R. L. Armstrong (1975) studied this question.
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