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Experimental rate c...
Experimental rate coefficients of F5+ recombining into F4+
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Ali, Safdar (author)
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Orban, Istvan (author)
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Mahmood, S. (author)
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Loch, S. D. (author)
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Schuch, Reinhold (author)
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(publisher)
- 2013
- 2013
- English.
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In: Astronomy and Astrophysics. - 0004-6361. ; 557, Article nr.-A2
Abstract
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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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