Abstract

The infrared transmittance of water vapor has been calculated over a wide range of path lengths, pressures, and temperatures. All contributing lines whose relative intensity is greater than 10−8 times that of the strongest line in any particular band have been included in the calculation. In addition, the contributions from the four major isotopic species have been included. Although the vibrational analysis has been done exactly, the rotational contributions for some of the weaker lines have been calculated from the symmetric rotator approximation. This approximation was not used for the frequencies and intensities of the stronger lines below 3400 cm−1 which are correctly included in the calculations. The final transmittance tables have been generated using the quasi-random model of molecular band absorption.

© 1964 Optical Society of America

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