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- Title
Experimental rate coefficients of F<sup>5+</sup> recombining into F<sup>4+</sup>.
- Authors
S. Ali; I. Orban; S. Mahmood; Loch, S. D.; Schuch, R.
- Abstract
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 (Δn = 0) core excitation and show very good agreement in the resonance energy positions and intensities. Trielectronic recombination with 2s2-2p2 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 103-106 K temperature range. The resulting temperature-dependent rate coefficients are compared with theoretical results from the literature. In the 103-104 K range, the calculated data significantly underestimates the plasma recombination rate coefficients. Above 8 × 104 K, our AUTOSTRUCTURE results and plasma rate coefficients from elsewhere show agreement that is better than 25% with the experimental results.
- Subjects
SPECTRUM analysis; HEAVY ions; SPECIAL relativity (Physics); DELOCALIZATION energy; MAXWELL-Boltzmann function
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2013, Vol 557, Issue 1, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201220628