Calculation of dielectronic recombination rate coefficients for hydrogen-like titanium, chromium, and nickel

Abstract

Dielectronic recombination (DR) rate coefficients are calculated for hydrogen-like Ti, Cr, and Ni at plasma temperatures 0.1–10 keV. The DR processes considered here are of the type 1 s+ εl→(2 ln 1 l 1)→1 sn 2 l 2+ γ. Explicit intermediate coupling calculations with configuration interactions have been performed for all intermediate resonance states with n=2–8. The 1/ n 3 scaling was employed to estimate the DR rate coefficients for n>8. The total DR rate coefficients have been obtained by summing over all partial DR rates. We find that the 1/ n 3 scaling law underestimates the DR rates summed over all states of each n. The present calculation yields significantly larger total DR rates for hydrogen-like ions compared to previous calculations reported in the literature.