Abstract
An expression is presented for the total band absorptance of vibration—rotation bands having Doppler-broadened lines. The result is similar in form to corresponding expressions for pressure broadening, in that the total band absorptance is expressed in terms of a dimensionless pressure path length, a bandwidth parameter, and a line-structure parameter. The band absorptance formulation is employed to estimate pressure levels at which Dopple broadening dominates over pressure broadening for CO 2 bands within the atmospheres of Venus and Mars, and for CH 4 bands within the atmospheres of Jupiter and Saturn.
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