Volume 557, September 2013
|Number of page(s)||5|
|Section||Atomic, molecular, and nuclear data|
|Published online||12 August 2013|
Experimental rate coefficients of F5+ recombining into F4+
1 Department of PhysicsStockholm
University, AlbaNova 10691 Stockholm, Sweden
2 Department of Physics, Auburn University, Auburn, AL 36849, USA
3 Department of Physics, University of Gujrat, 50700 Gujrat, Pakistan
Accepted: 19 May 2013
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 (△n = 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.
Key words: atomic data / atomic processes / plasmas
© ESO, 2013
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