Experimental rate coefficients of F5+ recombining into F4+
2013 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 557, Article nr.-A2 p.Article in journal (Refereed) Published
Recombination spectra of F5+ producing F4+ have been investigated with high-energy resolution, using the CRYRING heavy-ion storage ring. The absolute recombination rate coefficients are derived in the centre-of-mass energy range of 0-25 eV. The experimental results are compared with intermediate-coupling AUTOSTRUCTURE calculations for 2s-2p (Delta n = 0) core excitation and show very good agreement in the resonance energy positions and intensities. Trielectronic recombination with 2s(2)-2p(2) transitions are clearly identified in the spectrum. Contributions from F5+ ions in an initial metastable state are also considered. The energy-dependent recombination spectra are convoluted with Maxwell-Boltzmann energy distribution in the 10(3)-10(6) K temperature range. The resulting temperature-dependent rate coefficients are compared with theoretical results from the literature. In the 10(3)-10(4) K range, the calculated data significantly underestimates the plasma recombination rate coefficients. Above 8 x 10(4) K, our AUTOSTRUCTURE results and plasma rate coefficients from elsewhere show agreement that is better than 25% with the experimental results.
Place, publisher, year, edition, pages
2013. Vol. 557, Article nr.-A2 p.
atomic data, atomic processes, plasmas
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-96113DOI: 10.1051/0004-6361/201220628ISI: 000325211900022OAI: oai:DiVA.org:su-96113DiVA: diva2:663879
Swedish Research Council VR 2013-11-132013-11-112014-02-03Bibliographically approved