Dielectronic Recombination of Mg$^{2+}$: Importance of Relaxation and Term-Dependence

Discrepancies between two recent theoretical results [1,2] for the dielectronic recombination (DR) of low-charged Ne-like ions have been found and are attributed to orbital relaxation and term-dependence. For Ne-like Mg$^{2+}$, these effects cause differences in the maximum DR rate coefficients by more than 50\% between similar calculations employing orbitals determined from different optimization procedures. We resolve this discrepancy by utilizing a separate basis of non-orthogonal orbitals for the $2s^22p^6$ ground and $2l\rightarrow 3l^\prime$ excited states, and present new, more accurate DR rate coefficients for low-charged Ne-like ions.\newline $[1]$ O. Zatsarinny, et al., A\&A {\bf 426}, 699 (2004).\newline $[2]$ M. F. Gu, ApJ {\bf 590}, 1131 (2003).