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Updated: Aug 13, 2026

Hyperpolarized Xenon for NMR and MRI Applications
Published on: September 6, 2012
Amplified Collective Auger Decay of Double Inner-Shell Vacancy in Xe
Yasumasa Hikosaka1, Stephan Fritzsche2,3,4
1University of Toyama, Institute of Liberal Arts and Sciences, Toyama 930-0194, Japan.
Abstract:
The collective Auger decay (CAD) of Xe^{2+} 4d^{-2} double core-hole states in which two outer-shell electrons fill the double inner-shell vacancies while releasing a third energetic Auger electron is explored using multi-electron-ion coincidence spectroscopy. The CAD branching ratio relative to the total Auger emission of Xe^{2+} 4d^{-2} states is estimated to be 2×10^{-2}±1×10^{-2}, surpassing the branching ratios of previously reported CAD paths by a factor of 10 or more. This amplified CAD in Xe^{2+} 4d^{-2} states is primarily attributable to their near-degeneracy with intermediate configurations required to promote CAD in second-order perturbation theory. Such near degeneracy is characteristic of all double inner-shell vacancy states in medium and heavy elements, suggesting that CAD paths play a more pivotal role in the relaxation of core-excited matter than is currently understood.
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