Dielectronic recombination of Ni-, Cu-, and Zn-like tungsten ions

Abstract

Dielectronic recombination (DR) for Ni- and Zn-like Wq+ (q=46, 44) has been investigated extending the previous theoretical methodology (Kwon and Lee, 2016 [6]) applied for Cu-like W45+ which treats configuration mixing (CM) between resonances, non-resonant stabilization to non-closed inner-shells and decays to autoionizing levels possibly followed by cascades. For W46+ DR via 3[s,p,d]174lnl′ and 3[s,p,d]175lnl′ resonances (Δnc=1, 2) are included to the total Maxwellian rate coefficient. CM between 3p63d94lnl′ and 3p53d104lnl′ resonances largely changes low energy DR near the threshold. For W45+ radiative decay channels 3d104l′n′l′′ (4<n′<n) of DR via 3d104lnl′ resonances (Δnc=0) which were missed in our previous calculation (Kwon and Lee, 2016 [6]) are included and the rate coefficient is revised. For W44+ CM involving double electron core excitation is taken into account. All non-negligible core excitations Δnc=0 of 4s, Δnc=1 of 4s, 3d, and 3p, and Δnc=2 of 4s, 3d, and 3p are included to the total DR rate coefficient for W44+. Our total DR rate coefficients for Wq+ (q=46−44) are compared with available previous ab initio predictions by other level-to-level calculations and by a configuration-averaged level group calculation, and with ADAS data by semiempirical formula in detail.