Observation of anomalous behavior of the Xe 4d photoelectron satellites

The Xe 4d photoelectron satellites have been studied in the photon energy region 90-200 eV. The substantially improved energy resolution has enabled us to determine a wealth of satellites. A comparison of the satellite spectra at the intermediate excitation energies to the threshold-electron and the high-excitation-energy spectra shows the existence of several kinds of characteristic photon energy dependences of the Xe 4d satellite intensities. At the intermediate excitation energies, the satellites due to final states of both the 4d-15p-1np and 4d-15p-1md,ns (n>=6, m>=5) configurations occur.