INNER-SHELL PHOTOIONIZATION OF GROUP-IIB ATOMS

Total and partial photoionization cross sections, branching ratios, an d angular-distribution asymmetry parameters for inner subshells (nl,l greater than or equal to 2) of the group-IIB elements zinc, cadmium, a nd mercury have been calculated in both the relativistic random-phase approximation and the relativistic random-phase approximation modified to include relaxation. Comparisons are made between the results of th e two theoretical methods and with experiment where available. The pre sent theoretical results for the 3d inner-shell photoionization of zin c are not in accord with experiment. We confirm previous work [S. L. C arter and H. P. Kelly, J. Phys. B 11, 2467 (1978)] which demonstrated that relaxation is an important effect in photoionization of the 4d su bshell of atomic cadmium. It is also found that the inclusion of relax ation effects resolves a discrepancy between theory and experiment for the 4f inner-shell photoionization of atomic mercury.