Abstract

We calculated the concentration, pressure, and temperature dependence of the spectral absorptance of a vibrational absorption band. We found a smooth thermodynamic dependence for wavelength intervals where the average absorptance is less than 0.65. Individual rotational lines, whose parameters are often well known, were used as bases in the calculation of medium resolution spectra. We combined two modes of calculation: well-separated rotational lines plus interaction terms, or strongly overlapping lines that were represented by a compound line of similar shape plus corrections. The 1.9 and 6.3 μm bands of H2O and the 4.3 μm band of CO2 were examined in detail and compared with experiment.

© 1974 Optical Society of America

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