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Infrared Line Collisional Parameters of PH3 in Hydrogen: Measurements with Second-Order Approximation of Perturbation Theory

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Journal of Applied Spectroscopy Aims and scope

Room-temperature absorption by PH3–H2 mixtures in the ν2 and ν4 bands of phosphine (PH3) has been measured for low pressures. Fits of these spectra are made to determine the width of isolated lines and line mixing in a first-order Rosenkranz approximation. From the previous determinations, we deduce remarks on the lack of accuracy of predicting the collisional process. With the first-order Rosenkranz approximation, the collisional parameters are considered linear with pressure. In this work, we have considered spectra recorded for three doublets: A1 and A2 lines in the ν2 and ν4 bands of PH3 diluted with higher H2 pressure. We show that the line shifts are nonlinear with perturber pressures, which requires testing the fits of the recorded spectra with profiles developed in the secondorder approximation of the perturbation theory. Consequently, the first- and second-order mixing coefficients are determined and discussed. Throughout this study, we also show that the change in the intensity distribution is provided by the population exchange between 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 line width.

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Authors and Affiliations

  1. Laboratoire Technologie Energie et Matériaux Innovants TEMI, Faculté des Sciences de Gafsa, Campus Universitaire Sidi Ahmed Zarroug, 2112, Gafsa, Tunisia

    J. Salem & R. ben Younes

  2. Department of Physics, College of Sciences and Arts at Buraydah, Qassim University, Buraydah, Saudi Arabia

    R. Charguia

  3. Condensed Matter Physics Laboratory, Physics Department, Faculty of Sciences of Tunis, University of Tunis El Manar, 1060, Tunis, Tunisia

    R. Charguia

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  1. J. Salem
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  2. R. Charguia
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  3. R. ben Younes
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Correspondence to R. Charguia.

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Published in Zhurnal Prikladnoi Spektroskopii, Vol. 88, No. 3, pp. 351–359, May–June, 2021.

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Salem, J., Charguia, R. & Younes, R.b. Infrared Line Collisional Parameters of PH3 in Hydrogen: Measurements with Second-Order Approximation of Perturbation Theory. J Appl Spectrosc 88, 474–482 (2021). https://doi.org/10.1007/s10812-021-01196-2

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  • DOI: https://doi.org/10.1007/s10812-021-01196-2

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