State-selective quantum interference studied in the photo-recombination of Ar17+ ion

Abstract We investigate the total and partial cross sections of the state-selective photo-recombination (PR) from the ground state 1 s S 0 1 of H-like Ar 17+ ion to the 1 s 2 S 0 1 , 1 s 2 s S 0 1 , S 1 3 and 1 s 2 p P 0 , 1 , 2 3 , P 1 1 states of He-like Ar 16+ ion. The analysis is performed based on the close-coupling approximation and the fully relativistic Dirac R -matrix method, in which the unified treatments of the combined electron-ion PR process, including radiative and dielectronic recombination (DR) as coherent, interfering components are considered. The KLL PR resonance group are determined and identified according to the calculated energies and transition rates using the multiconfiguration Dirac–Fock (MCDF) method. The DR cross sections are also presented for comparison purposes. Our results show that the quantum interference between direct recombination and resonant recombination processes will strongly influence the intensity and shape of the PR cross sections, especially for the 2 s 2 p P 1 1 and 2 p 2 D 2 1 resonant regions. Comparison of our computed results with previously published experimental and theoretical values, when available, is made.