Two-electron and one-photon transitions in highly charged nickel-like ions

This paper calculates the transition wavelengths and probabilities of the two-electron and one-photon (TEOP) transition from the (3s1/2-1 4dj) J = 1,2 to (3p3/2-1 4s1/2)J = 1 and the (3p1/2-1 4s1/2) J = 1 to (3dj-1 4dj')J = 1,2 for highly charged Ni-like ions with atomic number Z in the range 47 ≤ Z ≤ 92. In the calculations, the multi-configuration Dirac–Fock method and corresponding program packages GRASP92 and REOS99 were used, and the relativistic effects, correlation effects and relaxation effects were considered systematically. It is found that the TEOP transitions are very sensitive to the correlation of electrons, and the probabilities will be enhanced sharply in some special Z regions along the isoelectronic sequence. The present TEOP transition wavelengths are compared with the available data from some previous publications, good agreement is obtained.