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Experimental rate coefficients of F5+ recombining into F4+

Ali, Safdar (author)
Orban, Istvan (author)
Mahmood, S. (author)
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Loch, S. D. (author)
Schuch, Reinhold (author)
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 (publisher)
2013
2013
English.
In: Astronomy and Astrophysics. - 0004-6361. ; 557, Article nr.-A2
  • swepub:Mat__t
Abstract Subject headings
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  • 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.

Subject headings

Natural Sciences  (hsv)
Physical Sciences  (hsv)
Astronomy, Astrophysics and Cosmology  (hsv)
Naturvetenskap  (hsv)
Fysik  (hsv)
Astronomi, astrofysik och kosmologi  (hsv)

Keyword

atomic data
atomic processes
plasmas

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