Absolute cross sections for the photoionization of 4d electrons in Xe+ andXe2+ ions

The partial and total absolute cross sections for the photoionization of Xe + and Xe2+ ions, respectively, have been measured in the 4d excitation regi on (50-130 eV). The experimental cross sections are compared with calculate d 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 th e Xe atom. The reliability of the experimental cross sections has been test ed by measuring the absolute photoionization cross section for the He+ ion.