Dielectronic recombination coefficient for Ni-like gadolinium

Dielectronic recombination (DR) coefficients for the ground-state ion of Ni-like ₆₄Gd have been calculated in the isolated-resonance approximation for temperatures in the range of 0.05{≤}T{≤}3 keV. The Auger and radiative rates of each doubly excited state were evaluated explicitly by using the multiconfiguration Dirac-Fock model. The calculations were carried out in the intermediate coupling. The effect of the configuration interaction was also included for the low-lying doubly excited states. The intermediate autoionizing states included in the present work are the states from the 3d^-14lnl' (n{≤}10), 3p^-14lnl' (n{≤}5), and 3s^-14lnl' (n{≤}5) configurations. The dielectronic recombination coefficients for Ni-like ₆₄Gd from the present calculations are 1.33×{}10^-10 and 1.08×{}10^-10 cm³/sec for T=500 and 800 eV, respectively. The semiempirical Burgess-Merts formula has been found to overestimate the dielectronic recombination coefficients for the Ni-like ₆₄Gd by a factor of 5 for T{≥}250 eV.