CROSS-SECTIONS AND ANGULAR-DISTRIBUTIONS OF THE PHOTOELECTRON CORRELATION SATELLITES OF THE XE ATOM

A theoretical and experimental study of the behaviour of the correlati on satellites arising during 5s photoionization of xenon is presented. Many-body perturbation theory and configuration-interaction technique s have been applied to calculate the wavefunctions of the Xe II ionic states. An expression for the angular distribution parameter of the ph otoelectrons taking into account final-ionic-state configuration inter action is derived. Photoionization cross sections and angular distribu tion parameters were calculated for the 5s main line and the majority of the satellite lines and compared with our high-resolution measureme nts and earlier lower resolution measurements. The differences in the angular distribution parameter dependence on the photon energy for the 5s main line and satellites were analysed in terms of their origin. T he most important mechanisms are: interference of several photoionizat ion channels characterizing different orbital momenta of the photoelec tron, the mixture of terms with different total orbital momenta in the final ionic state, and the dependence of the photoelectron wavefuncti ons on the total momentum of the photoelectrons.