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

Received: 24 March 2020     Accepted: 24 August 2020     Published: 26 October 2020
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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.

Published in Science Journal of Chemistry (Volume 8, Issue 5)
DOI 10.11648/j.sjc.20200805.15
Page(s) 124-130
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2020. Published by Science Publishing Group

Keywords

Phosphine, Hydrogen, Collisional Parameters, Infrared, Second-order Approximation

References
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[8] Salem J., Bouanich J. P., Walrand J., Aroui H., Blanquet G. Helium- and argon-broadening coefficients of phosphine lines in the v2 and v4 bands. J. Mol. Spectrosc. 2005, 232, 247-254.
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Cite This Article
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    Jamel Salem, Rached Ben Younes. (2020). Infrared Line Collisional Parameters of PH3 in Hydrogen: Measurements with Second-order Approximation of Perturbation Theory. Science Journal of Chemistry, 8(5), 124-130. https://doi.org/10.11648/j.sjc.20200805.15

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    ACS Style

    Jamel Salem; Rached Ben Younes. Infrared Line Collisional Parameters of PH3 in Hydrogen: Measurements with Second-order Approximation of Perturbation Theory. Sci. J. Chem. 2020, 8(5), 124-130. doi: 10.11648/j.sjc.20200805.15

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    AMA Style

    Jamel Salem, Rached Ben Younes. Infrared Line Collisional Parameters of PH3 in Hydrogen: Measurements with Second-order Approximation of Perturbation Theory. Sci J Chem. 2020;8(5):124-130. doi: 10.11648/j.sjc.20200805.15

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  • @article{10.11648/j.sjc.20200805.15,
      author = {Jamel Salem and Rached Ben Younes},
      title = {Infrared Line Collisional Parameters of PH3 in Hydrogen: Measurements with Second-order Approximation of Perturbation Theory},
      journal = {Science Journal of Chemistry},
      volume = {8},
      number = {5},
      pages = {124-130},
      doi = {10.11648/j.sjc.20200805.15},
      url = {https://doi.org/10.11648/j.sjc.20200805.15},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.sjc.20200805.15},
      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.},
     year = {2020}
    }
    

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    T1  - Infrared Line Collisional Parameters of PH3 in Hydrogen: Measurements with Second-order Approximation of Perturbation Theory
    AU  - Jamel Salem
    AU  - Rached Ben Younes
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    N1  - https://doi.org/10.11648/j.sjc.20200805.15
    DO  - 10.11648/j.sjc.20200805.15
    T2  - Science Journal of Chemistry
    JF  - Science Journal of Chemistry
    JO  - Science Journal of Chemistry
    SP  - 124
    EP  - 130
    PB  - Science Publishing Group
    SN  - 2330-099X
    UR  - https://doi.org/10.11648/j.sjc.20200805.15
    AB  - 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.
    VL  - 8
    IS  - 5
    ER  - 

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Author Information
  • Department of Physics, Faculty of Science of Gafsa, University of Gafsa, Gafsa, Tunisia

  • Department of Physics, Faculty of Science of Gafsa, University of Gafsa, Gafsa, Tunisia

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