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On the determination of absolute intensities from single- and multiple-path absorption measurements

Penner, S. S. and Aroeste, H. (1955) On the determination of absolute intensities from single- and multiple-path absorption measurements. Journal of Chemical Physics, 23 (12). pp. 2244-2247. ISSN 0021-9606. doi:10.1063/1.1740731.

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The physical principles involved in conventional absolute intensity measurements are reviewed. Experimental difficulties rule out the use of extrapolation techniques for some spectral transitions. For this reason it is of interest to re-examine the possibility of using total absorption measurements, in conjunction with the curves of growth, for making intensity estimates. Extrapolation methods yield results which are independent of spectral line shape. Use of the curves of growth, on the other hand, implies the assumption that the line contour can be described by combined Doppler and Lorentz broadening. The curves of growth permit a unique correlation between total absorption and f-value either for spectral lines with pure Doppler broadening or for pure collision broadening. Furthermore, a simple experimental procedure can be devised for estimating both the absolute intensity and the spectral line profile on the basis of single-path and multiple-path absorption measurements. The suggested procedure involves absorption' measurements for optical densities (path lengths) under conditions in which the integrated fractional absorption is a relatively sensitive function of spectral line shape. Representative calculations referring to utilization of the proposed method have been carried out for spectral lines belonging to the ^2∑→^2II transitions, (0,0)-band, of OH, and also for lines belonging to the fundamental vibration-rotation spectrum of CO.

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Additional Information:© 1955 American Institute of Physics. Received January 31, 1955. Online Publication Date: 29 December 2004. Supported by the Office of Naval Research under Contract Nonr-220(03), NR 015401. A preliminary account of this work was presented at a "Stellar Atmospheres Conference," Indiana University, Bloomington, Indiana, September 30 to October 2, 1954.
Group:Guggenheim Jet Propulsion Center
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Office of Naval Research (ONR)Nonr-220(03), NR 015401
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Guggenheim Jet Propulsion Center 71
Issue or Number:12
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Official Citation:On the Determination of Absolute Intensities from Single‐ and Multiple‐Path Absorption Measurements S. S. Penner and H. Aroeste J. Chem. Phys. 23, 2244 (1955); doi:10.1063/1.1740731
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21813
Deposited By: Ruth Sustaita
Deposited On:19 Jan 2011 21:10
Last Modified:09 Nov 2021 16:00

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