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Published May 1, 1957 | Published
Journal Article Open

Infrared emissivities and absorptivities of gases


Approximate analytic expressions are obtained for the "effective band widths" and emissivities of diatomic molecules at elevated pressures. The absorptivities of molecular vibration‐rotation bands are evaluated for radiation emitted by similar molecular vibration‐rotation bands and for radiation emitted by blackbodies. The results obtained for the absorptivity calculations compare favorably with available empirical correlations for H_2O. The postulated model does not apply to CO_2 and, therefore, no satisfactory theoretical formula has been derived for the absorptivities of this molecule. The appendix (by A. Thomson) is devoted to a critical examination of the limits of validity of the effective band‐width concept for different molecules.

Additional Information

© 1957 American Institute of Physics. Received September 18, 1956. Online Publication Date: 17 May 2004. Supported by the U. S. Office of Naval Research under Contract Nonr-220(03), NR 015401.

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