Hyperfine excitation of 13CCH and C13CH by collisions with para- H2
In: Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, 2023, 523 (3), pp.3732-3740. ⟨10.1093/mnras/stad1646⟩; (2023-08-08)
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Zugriff:
International audience; The computation of hyperfine resolved cross sections and rate coefficients for open-shell molecules in collision with H2 is a true methodological and numerical challenge. Such collisional data are however required to interpret astrophysical observations. We report the first hyperfine resolved rate coefficients for (de-)excitation of 13CCH and C13CH isotopologues induced by collisions with para-H2. These calculations have been performed using a recently published C2H-H2 potential energy surface. Hyperfine resolved cross sections and rate coefficients between the first 98 energy levels of the two isotopologues were determined using a recoupling technique for temperatures ranging from 5 to 100 K. Significant isotopic substitution effects were found, showing the necessity of computing isotopologue specific collisional data. These rate coefficents have then been used in a simple radiative transfer modelling for typical molecular cloud conditions. © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
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Hyperfine excitation of 13CCH and C13CH by collisions with para- H2
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Autor/in / Beteiligte Person: | Pirlot Jankowiak, P. ; Lique, F ; Dagdigian, P J ; Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) –UMR 6251, F-35000 Rennes, France ; Department of Chemistry, The Johns Hopkins University, Baltimore, MD 21218-2685, USA ; Institut de Physique de Rennes (IPR) ; Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS) ; Johns Hopkins University (JHU) ; TGCC ; European Research Council, ERC, (811363) ; Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA ; Grand Équipement National De Calcul Intensif, GENCI |
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Quelle: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, 2023, 523 (3), pp.3732-3740. ⟨10.1093/mnras/stad1646⟩; (2023-08-08) |
Veröffentlichung: | HAL CCSD, 2023 |
Medientyp: | unknown |
ISSN: | 0035-8711 (print) ; 1365-2966 (print) |
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