Dielectronic recombination of Cu-like W45+

Abstract We have investigated dielectronic recombination (DR) for Cu-like W 45+ forming Zn-like W 44+ by theoretical calculation using the flexible atomic code based on an independent process, isolated resonance, and distorted wave approximation. We have focused on the effect of configuration mixing involving double electron core excitation as well as single electron core excitation on the DR via 3 d 9 4 l 4 l ′ 4 l ″ and 3 p 5 3 d 10 4 l 4 l ′ 4 l ″ resonances by inner-shell core excitation Δ n c = 1 . About 20% and over 100% changes in Maxwellian rate coefficient are shown at high energies over 200 eV and at low energies near the threshold, respectively, by the configuration mixing. Non-resonant stabilizations (NRS) and decays to autoionizing levels possibly followed by cascades (DAC) to non-closed inner-shells 3 d 9 4 l 4 l ′ 4 l ″ are also considered. The NRS and DAC effect on the DR Maxwellian rate coefficient is relatively smaller than the configuration mixing effect and is less than ~ 20 % . Particular attention has been paid to the DR via 3 d 10 4 lnl ′ resonances by valence-shell core excitation Δ n c = 0 which was not considered in the previous work (Behar et al., 1997 [4] ). The 3 d 10 4 lnl ′ resonances very dominate the DR at low energies below ~ 100 eV . Δ n c = 2 core excitations are small but not negligible ( ~ 10 % ) relatively at high energy range around 10 keV. Our total DR rate coefficient shows the difference with the recombination coefficient on the ADAS database obtained by using a simple semiempirical formula over order of magnitude at low energies and about 30–50% at 2–7 keV energy range where W 45+ is abundant.