Abstract
Energy levels, radiative transition probabilities and autoionization rates for Be-like Ne (Ne6+) including 1s22pnl (n = 2-9, l n-1) and 1s23l´nl (n = 3-6, l n-1) states are calculated. Two theoretical methods, the perturbation theory Z-expansion (MZ code) method and the multi-configurational Hartree-Fock (Cowan code) method, are used for the calculations. Autoionizing levels above the 1s22s and 1s22p thresholds are considered and their contributions computed. The state-selective dielectronic recombination rate coefficients from Li-like Ne (Ne7+) ions to Be-like Ne (Ne6+) ions for bound states of Ne6+ ions are obtained. Configuration mixing plays an important role for the principal quantum number, n, distribution of the dielectronic recombination rate coefficients for n6 levels. The orbital angular momentum quantum number, l, distribution of the rate coefficients shows a peak around l = 4-5. The rate coefficients for the excited states with higher n are extrapolated using a scaling law. The total dielectronic recombination rate coefficients are derived as a function of electron temperature.
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