Threshold excitation of short-lived atomic inner-shell hole states with synchrotron radiation

The Xe L3-M4M5 (1G4) Auger spectrum, photoexcited in the vicinity of the L3 edge, has been measured as a function of photon energy. The nd spectator-electron satellite lines show resonant behavior. The diagram line exhibits the largest (greater than about 1 eV) post-collision interaction shift yet observed. For comparison with the data, the first fully quantum-mechanical calculation of the post-collision interaction in deep inner-shell Auger decay is performed, based on a resonant-scattering approach that involves a complete summation over intermediate L3 one-hole states.