Threshold Excitation of Short-Lived Atomic Inner-Shell Hole States with Synchrotron Radiation

Abstract

The Xe ${L}_{3}\ensuremath{-}{M}_{4}{M}_{5} (^{1}G_{4})$ Auger spectrum, photoexcited in the vicinity of the ${L}_{3}$ edge, has been measured as a function of photon energy. The $\mathrm{nd}$ spectator-electron satellite lines show resonant behavior. The diagram line exhibits the larges (\ensuremath{\gtrsim} 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 ${L}_{3}$ one-hole states.