Absolute cross sections for the photoionization of 4d electrons in Xe⁺and Xe²⁺ions

The partial and total absolute cross sections for the photoionization of Xe + and Xe 2+ ions, respectively, have been measured in the 4d excitation region (50-130 eV). The experimental cross sections are compared with calculated values obtained by the random phase approximation method taking exchange and rearrangement into account. The maximum total cross section values are 27(3) Mb for both ions, a value also reported for the photoionization of the Xe atom. The reliability of the experimental cross sections has been tested by measuring the absolute photoionization cross section for the He + ion.