Resonance excitation process for Ni-like gold

Abstract

A detailed and large-scale calculation on the resonant excitation rate coefficients from the ground state to the 106 fine-structure levels belonging to 3 l 17 4 l ′ ( l = 0 , 1 , 2 ; l ′ = 0 , 1 , 2 , 3 ) configurations of Ni-like gold have been performed using the relativistic distorted-wave approximation. The contributions through all possible Cu-like doubly excited states 3 l 17 4 l ′ n ″ l ″ and 3 l 17 5 l ′ n ″ l ″ ( n ″ ≤ 15 , l ″ ≤ 8 ) are calculated explicitly. The radiative damping effects on resonant excitation rates are studied. Significant effects arising from decays to autoionizing levels are also investigated. The n −3scaling law is investigated and is used to obtain the contributions from high- n configurations. Contributions from resonant excitation are found to be as important as direct excitation processes for most transitions. In some cases, resonant excitation can enhance the excitation rate coefficients by an order of magnitude. In addition, the total dielectronic recombination rate coefficients of Ni-like gold are also presented and compared with other works.