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

Abstract Dielectronic recombination (DR) for Ni- and Zn-like W q+ (q=46, 44) has been investigated extending the previous theoretical methodology (Kwon and Lee, 2016 [6] ) applied for Cu-like W 45+ 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 W 46+ DR via 3 [ s , p , d ] 17 4 lnl ′ and 3 [ s , p , d ] 17 5 lnl ′ resonances ( Δ n c = 1 , 2) are included to the total Maxwellian rate coefficient. CM between 3 p 6 3 d 9 4 lnl ′ and 3 p 5 3 d 10 4 lnl ′ resonances largely changes low energy DR near the threshold. For W 45+ radiative decay channels 3 d 10 4 l ′ n ′ l ′′ ( 4 n ′ n ) of DR via 3 d 10 4 lnl ′ resonances ( Δ n c = 0 ) which were missed in our previous calculation (Kwon and Lee, 2016 [6] ) are included and the rate coefficient is revised. For W 44+ CM involving double electron core excitation is taken into account. All non-negligible core excitations Δ n c = 0 of 4 s , Δ n c = 1 of 4 s , 3 d , and 3 p , and Δ n c = 2 of 4 s , 3 d , and 3 p are included to the total DR rate coefficient for W 44+ . Our total DR rate coefficients for W q+ ( 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.