Dielectronic recombination data for dynamic finite-density plasmas IX : The fluorine isoelectronic sequence

Zatsarinny, O. and Gorczyca, T.W. and Fu, J. and Korista, K.T. and Badnell, N.R. and Savin, D.W. (2006) Dielectronic recombination data for dynamic finite-density plasmas IX : The fluorine isoelectronic sequence. Experimental Astronomy, 447 (1). pp. 379-387. ISSN 0922-6435

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Abstract

Partial and total dielectronic recombination (DR) rate coefficients for fluorine- like ions forming neon-like systems have been calculated as part of the assembly of a final-state level-resolved DR database necessary for the modelling of dynamic finite-density plasmas (Badnell et al. 2003). Calculations have been performed for DR of both ground and metastable initial states for Ne+ to Zn21+, as well as for Kr27+, Mo33+, and Xe45+. Results for a selection of ions are presented and discussed. We find that low-temperature DR, via 2 -> 2 core excitations involving no change in the principal quantum number of the core electron, does not scale smoothly with nuclear charge Z due to resonances straddling the ionization limit of the recombined system, thereby making explicit calculations for each ion necessary. Most of the earlier calculations neglected contributions from the fine-structure 2p(3/2)-2p(1/2) excitation which has been shown to be very important for low-temperature DR coefficients. The DR data are suitable for modelling of solar and cosmic plasmas under conditions of collisional ionization equilibrium, photoionization equilibrium, and non-equilibrium ionization.