Study of photoeffect phenomena on the basis of the multiconfiguration Dirac - Fock method: I. Photoionization of 4d subshells in atomic barium

We propose a method for the computation of photoeffect parameters. We combine the multiconfiguration Dirac - Fock method to find atom and ion wavefunctions and the use of relativistic one-electron photoionization cross sections. We use this method to calculate the 4d subshells photoionization cross sections, the 4d photoelectron spectra and the 4d branching ratios in atomic barium. The results are compared with other theoretical calculations and experimental data.