Infrared Transmission of Synthetic Atmospheres III Absorption by Water Vapor

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Abstract
The total absorption ∫ Avdv has been measured for the water vapor bands at 6.3, 3.2, 2.7, 1.87, 1.38, 1.1, and 0.94μ under simulated atmospheric conditions. The water vapor absorber concentrations studied ranged from 0.004 to 3.8 cm of precipitable water. Nitrogen was added to give total pressures up to atmospheric; the effects of nitrogen and oxygen on total absorption were found to be similar. The experimental data can be satisfactorily represented by two types of empirical relations:(1) For small values of total absorption,∫ Avdv=cw½(P+p)k;(2) For large values of total absorption,∫ Avdv=C+D Logw +K Log(P+p),where w is the H2O absorber concentration, p is the H2O partial pressure, and P is the total pressure. Values of the empirically determined constants c, k, C, D, and K are given for each of the spectral regions of characteristic absorption. The results are compared with those of other experimentalists.

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