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The Emission of Radiation from Diatomic Gases. IV. Emissivity Calculations for CO and HCl for Nonoverlapping Rotational Lines as a Function of Temperature and Optical Density

Penner, S. S. (1952) The Emission of Radiation from Diatomic Gases. IV. Emissivity Calculations for CO and HCl for Nonoverlapping Rotational Lines as a Function of Temperature and Optical Density. Journal of Applied Physics, 23 (8). pp. 825-837. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:20091211-094656109

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Abstract

Simplified expressions have been developed for the engineering emissivity of uniformly distributed diatomic gases for nonoverlapping rotational lines with a resonance contour. Unfortunately the rotational half-widths for spectral lines arising from transitions between excited vibrational energy levels are generally not known. For this reason it was necessary to make the assumption that the rotational half-widths for transitions of the form n-->n+v, v=1 or 2, are identical. The theoretical analysis is, however, sufficiently general to be useful without modification when accurate data concerning the dependence of line-width on vibrational excitation become available. Explicit expressions have been obtained for the contributions to the total emissivity associated with individual vibration-rotation bands. Representative emissivity calculations have been carried out for CO and HCl. Comparison of the calculated emissivities of CO with experimental data shows only fair agreement, suggesting either that the assumed description of rotational half-widths is inadequate or else that the empirical emissivity data are not reliable at elevated temperatures.


Item Type:Article
Related URLs:
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http://link.aip.org/link/?JAPIAU/23/825/1PublisherUNSPECIFIED
Additional Information:Reprinted from JOURNAL OF APPLIED PHYSICS, Vol. 23, No. 8, 825-837, August, 1952. Copyright 1952 by the American Institute of Physics. Received February 4, 1952. Supported by the ONR under Contract Nonr-220(03), NR 015 210. Presented, in part, before the Symposium on Molecular Structure and Spectroscopy, Columbus, June, 1952.
Group:Guggenheim Jet Propulsion Center
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Funding AgencyGrant Number
Office of Naval ResearchNonr-220 (03), NR 015 210
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Guggenheim Jet Propulsion Center26
Record Number:CaltechAUTHORS:20091211-094656109
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20091211-094656109
Official Citation:The Emission of Radiation from Diatomic Gases. IV. Emissivity Calculations for CO and HCl for Nonoverlapping Rotational Lines as a Function of Temperature and Optical Density S. S. Penner, J. Appl. Phys. 23, 825 (1952), DOI:10.1063/1.1702315
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16958
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:14 Dec 2009 22:15
Last Modified:26 Dec 2012 11:38

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