DIELECTRONIC RECOMBINATION RATES IN H-LIKE AR17-LIKE AR8+( TO NE)

This paper presents systematic calculations of the dielectronic recomb ination (DR) rate coefficient for all energy levels in the ground conf iguration of each L-shell argon ion, Li-like Ar15+ to Ne-like Ar8+. Th e DR rate coefficients from H-like Ar17+ and He-like Ar16+ an also cal culated. The rate coefficients are calculated ab initio using the full y relativistic, parametric potential atomic structure code RELAC. Auto ionization rates are computed in the distorted wave approximation usin g RELAC's wave functions. Configuration interaction (CI) in the levels of the initial and recombined ion is taken into account; CI strongly affects the energies of levels close to the continuum and strongly enh ances the rates of weak autoionizing transitions. The contributions to recombination from the promotion of an n = 1 (K shell) or an n = 2 (L shell) electron are calculated. Capture of a free electron into level s with principal quantum numbers as high as n = 14 is allowed, and is extended to n = 18 in the case of Li-and Be-like ions. The contributio n to recombination through high angular momentum orbitals (l less than or equal to 6) is included in the calculations. [S1050-2947(97)03612- 3].