Orbital sensitivity in Mg2+ dielectronic recombination calculations

Fu, J. and Gorczyca, T.W. and Nikolic, D. and Badnell, N.R. and Savin, D.W. and Gu, M.F. (2008) Orbital sensitivity in Mg2+ dielectronic recombination calculations. Physical Review A, 77 (3). ISSN 1050-2947 (http://dx.doi.org/10.1103/PhysRevA.77.032713)

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We have investigated the reason for significant discrepancies between the results of two recent, similar computational methods [Zatsarinny et al., Astron. Astrophys. 426, 699 (2004); Gu, Astrophys. J. 590, 1131 (2003)] for dielectronic recombination (DR) of Mg2+. It is found that the choice of orbital description can lead to discrepancies by as much as a factor of 2 between total peak DR rate coefficients resulting from otherwise-identical computations. These unexpected differences are attributed to the large sensitivity to bound-orbital relaxation and continuum-orbital description effects on the computed radiative and autoionizing transitions arising from accidental cancellation. In order to obviate these effects, an approach, using a separate, nonorthogonal orbital basis for each configuration, is employed to yield a DR rate coefficient that we assess to be more reliable than all earlier published results.