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Excitation and charge transfer in low-energy hydrogen atom collisions with neutral iron
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. 612, article id A90Article in journal (Refereed) Published
Abstract [en]

Data for inelastic processes due to hydrogen atom collisions with iron are needed for accurate modelling of the iron spectrum in late-type stars. Excitation and charge transfer in low-energy Fe+H collisions is studied theoretically using a previously presented method based on an asymptotic two-electron linear combination of atomic orbitals model of ionic-covalent interactions in the neutral atom-hydrogen-atom system, together with the multi-channel Landau-Zener model. An extensive calculation including 166 covalent states and 25 ionic states is presented and rate coefficients are calculated for temperatures in the range 1000-20 000 K. The largest rates are found for charge transfer processes to and from two clusters of states around 6.3 and 6.6 eV excitation, corresponding in both cases to active 4d and 5p electrons undergoing transfer. Excitation and de-excitation processes among these two sets of states are also significant.

Place, publisher, year, edition, pages
EDP SCIENCES S A , 2018. Vol. 612, article id A90
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-356398DOI: 10.1051/0004-6361/201732365ISI: 000431338900001OAI: oai:DiVA.org:uu-356398DiVA, id: diva2:1235404
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationAvailable from: 2018-07-25 Created: 2018-07-25 Last updated: 2018-07-25Bibliographically approved

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Barklem, Paul S.

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