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Electron-impact excitation of neutral oxygen
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
2007 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 462, no 2, 781-788 p.Article in journal (Refereed) Published
Abstract [en]

Aims.Our goal was to calculate transition rates from ground and excited states in neutral oxygen atoms due to electron collisions for non-LTE modelling of oxygen in late-type stellar atmospheres, thus enabling the reliable interpretation of oxygen lines in stellar spectra.Methods.A 38-state R-matrix calculation in LS-coupling has been performed. Basis orbitals from the literature are adopted, and a large set of configurations are included to obtain good representations of the target wave functions. Rate coefficients are calculated by averaging over a Maxwellian velocity distribution. Results.Estimates for the cross sections and rate coefficients are presented for transitions between the seven lowest LS states of neutral oxygen. The cross sections for excitation from the ground state compare well with existing experimental and recent theoretical results.

Place, publisher, year, edition, pages
2007. Vol. 462, no 2, 781-788 p.
Keyword [en]
atomic data
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-25523DOI: 10.1051/0004-6361:20066341ISI: 000243686600040OAI: oai:DiVA.org:uu-25523DiVA: diva2:53297
Available from: 2007-02-13 Created: 2007-02-13 Last updated: 2017-12-07Bibliographically approved

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Barklem, Paul

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