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Excitation and charge transfer in low-energy hydrogen atom collisions with neutral carbon and nitrogen
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
2019 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 625, article id A78Article in journal (Refereed) Published
Abstract [en]

Low-energy inelastic collisions with neutral hydrogen atoms are important processes in stellar atmospheres, and a persistent source of uncertainty in non-LTE modelling of stellar spectra. We have calculated and studied excitation and charge transfer of C I and of N I due to such collisions. We used a previously presented method that is based on an asymptotic two-electron linear combination of atomic orbitals (LCAO) model of ionic-covalent interactions for the adiabatic potential energies, combined with the multichannel Landau-Zener model for the collision dynamics. We find that charge transfer processes typically lead to much larger rate coefficients than excitation processes do, consistent with studies of other atomic species. Two-electron processes were considered and lead to non-zero rate coefficients that can potentially impact statistical equilibrium calculations. However, they were included in the model in an approximate way, via an estimate for the two-electron coupling that was presented earlier in the literature: the validity of these data should be checked in a future work.

Place, publisher, year, edition, pages
EDP SCIENCES S A , 2019. Vol. 625, article id A78
Keywords [en]
atomic data, atomic processes, line: formation, radiative transfer, stars: abundances
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-385004DOI: 10.1051/0004-6361/201935101ISI: 000468126800001OAI: oai:DiVA.org:uu-385004DiVA, id: diva2:1322623
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationAvailable from: 2019-06-11 Created: 2019-06-11 Last updated: 2019-06-11Bibliographically approved

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