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Published April 1953 | Published + Reprint
Journal Article Open

Effect of Spectral Line Shape on Apparent Rotational Temperatures of OH

Penner, S. S.


The effect of spectral line shape on apparent rotational temperatures of OH has been investigated for the P_1 branch, ^2Σ-->^2π transitions, (0, 0) band, by treating the ratio of collision half-width to Doppler half-width as a variable parameter. The results of calculations for emission experiments, using conventional plots, show a large effect of line shape on apparent temperature. In general, the greater the ratio of collision half-width to Doppler half-width, the smaller the distortion of experimental data. The analysis predicts higher apparent rotational temperatures for isothermal systems at reduced pressures than at atmospheric pressures. Although this result is in agreement with experimental observations on flames, it cannot be used as an explanation for the observed data without auxiliary studies proving that distortion of data is of importance in any given case. The two-path method for determining temperatures and emissivities (concentrations) in flames has been extended to spectral lines with combined Doppler- and collision-broadening.

Additional Information

Reprinted from THE JOURNAL OF CHEMICAL PHYSICS, Vol. 21, No. 4, 686-688, April, 1953. Copyright © 1953 American Institute of Physics. Received November 30, 1952. Supported by the U. S. Office of Naval Research under Contract No. Nonr-220(03), NR 015 210.

Attached Files

Published - JChemPhys_21_686.pdf

Reprint - 43_Penner_SS_1953.pdf


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August 19, 2023
October 19, 2023