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Formation of the CH/CD molecules through radiative association of C with H/D
Department of Chemistry and Molecular Biology, University of Gothenburg , SE-405 30 Gothenburg, Sweden.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-7629-0169
Department of Chemistry and Molecular Biology, University of Gothenburg , SE-405 30 Gothenburg, Sweden.ORCID iD: 0000-0002-9527-3890
2022 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 517, no 4, p. 4892-4901Article in journal (Refereed) Published
Abstract [en]

Reaction rate constants have been calculated for the formation of CH and CD molecules through radiative association of C and H/D atoms in their ground states. Quantum mechanical and semiclassical/classical methods were used to obtain the reaction cross-sections. Shape resonances and inverse pre-dissociation are accounted for with Breit–Wigner theory. The potential, permanent/transition dipole moment curves and experimental pre-dissociation widths are taken from the literature. The resulting reaction rate constants were fitted to the Kooij formula for use in astrochemical modelling. Our rate constant is 3.5 × 10−17 cm3 s−1 at 100 K and it peaks at 20 K, where it is 8.0 × 10−17 cm3 s−1. These values are larger than what has been obtained in earlier studies but not large enough to account for the interstellar abundance of CH.

Place, publisher, year, edition, pages
Oxford University Press, 2022. Vol. 517, no 4, p. 4892-4901
Keywords [en]
astrochemistry, molecular processes, radiation mechanisms: general, software: simulations, ISM: abundances
National Category
Physical Chemistry Astronomy, Astrophysics and Cosmology
Research subject
Applied Physics
Identifiers
URN: urn:nbn:se:ltu:diva-94104DOI: 10.1093/mnras/stac2881ISI: 000881808900002Scopus ID: 2-s2.0-85145353954OAI: oai:DiVA.org:ltu-94104DiVA, id: diva2:1710632
Funder
Swedish Research Council, 2020-05293Knut and Alice Wallenberg Foundation
Note

Validerad;2022;Nivå 2;2022-11-14 (hanlid)

Available from: 2022-11-14 Created: 2022-11-14 Last updated: 2023-10-11Bibliographically approved

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