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Excitation and charge transfer in low-energy hydrogen atom collisions with neutral oxygen
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
2018 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 610, article id A57Article in journal (Refereed) Published
Abstract [en]

Excitation and charge transfer in low-energy O+H collisions is studied; it is a problem of importance for modelling stellar spectra and obtaining accurate oxygen abundances in late-type stars including the Sun. The collisions have been studied theoretically using a previously presented method based on an asymptotic two-electron linear combination of atomic orbitals (LCAO) model of ionic-covalent interactions in the neutral atom-hydrogen-atom system, together with the multichannel Landau-Zener model. The method has been extended to include configurations involving excited states of hydrogen using an estimate for the two-electron transition coupling, but this extension was found to not lead to any remarkably high rates. Rate coefficients are calculated for temperatures in the range 1000-20000 K, and charge transfer and (de) excitation processes involving the first excited S-states, 4s.S-5(0) and 4s.S-3(0), are found to have the highest rates.

Place, publisher, year, edition, pages
EDP SCIENCES S A , 2018. Vol. 610, article id A57
Keywords [en]
atomic data, atomic processes, line: formation, Sun: abundances, stars: abundances
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-350901DOI: 10.1051/0004-6361/201731968ISI: 000427137600002OAI: oai:DiVA.org:uu-350901DiVA, id: diva2:1206531
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationAvailable from: 2018-05-17 Created: 2018-05-17 Last updated: 2018-05-17Bibliographically approved

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Barklem, Paul

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