Volume 8, Issue 5, October 2020, Page: 124-130
Infrared Line Collisional Parameters of PH3 in Hydrogen: Measurements with Second-order Approximation of Perturbation Theory
Jamel Salem, Department of Physics, Faculty of Science of Gafsa, University of Gafsa, Gafsa, Tunisia
Rached Ben Younes, Department of Physics, Faculty of Science of Gafsa, University of Gafsa, Gafsa, Tunisia
Received: Mar. 24, 2020;       Accepted: Aug. 24, 2020;       Published: Oct. 26, 2020
DOI: 10.11648/j.sjc.20200805.15      View  63      Downloads  42
Abstract
Measurement of room temperature absorption by PH3–H2 mixtures in the v2 and v4 bands of phosphine (PH3) have been made for low pressures. Fits of these spectra are made for the determination of the width for isolated lines, and line mixing in first-order Rosenkranz approximation. From the previous determinations, we deduce some remarks on the lack of accuracy for the prediction of the collisional process. With the first-order Rosenkranz approximation, the collisional parameters are considered linear with pressure. In this work, we have considered some spectra recorded for three doublets A1 and A2 lines in the v2 and v4 bands of PH3 diluted with higher H2 pressure. We show that the line shifts are non-linear with perturber pressures, which requires testing the fits of the recorded spectra by profiles developed in the second-order approximation of the perturbation theory. Consequently, the first and second-order mixing coefficients are determined and discussed. Also, through this study, we show that the change of the intensities distribution is provided by the populations exchange between the low energy levels for the two components of doublets A1 and A2 lines and is described through the second-order mixing parameter. Thereby, we show the mixing effect on the line width.
Keywords
Phosphine, Hydrogen, Collisional Parameters, Infrared, Second-order Approximation
To cite this article
Jamel Salem, Rached Ben Younes, Infrared Line Collisional Parameters of PH3 in Hydrogen: Measurements with Second-order Approximation of Perturbation Theory, Science Journal of Chemistry. Vol. 8, No. 5, 2020, pp. 124-130. doi: 10.11648/j.sjc.20200805.15
Copyright
Copyright © 2020 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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