Observation of four-electron Auger processes

A. Müller, A. Borovik, T. Buhr, J. Hellhund, K. Holste, A. L.D. Kilcoyne, S. Klumpp, M. Martins, S. Ricz, J. Viefhaus, S. Schippers

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Multiple ionization of ions subsequent to absorption of a single photon has been studied employing a photon-ion merged-beam setup at the PETRA III synchrotron radiation facility of DESY in Hamburg. Absolute cross sections for single, double and triple ionization of C+ ions were measured with emphasis on specific well defined terms of K-shell excited C+. In particular, the terms C+ (1s2s22p2 2D,2P) were excited from the ground level of C+. Subsequent autoionization processes resulted in the production of C2+, C3+ and C4+ ions. The associated decay mechanisms are single-Auger, double-Auger and triple-Auger decay. The observation of C4+ products arising from C+(1s2s22p2 2D,2P) unambiguously confirmed the existence of triple-Auger decay, i.e., a process in which 4 electrons interact with one another such that one fills the K-shell vacancy and the others are simultaneously ejected. The experiment yields branching ratios for the Auger decay channels as well as individual decay rates for autoionization and radiative stabilization of the C+(1s2s22p2 2D,2P) terms.

Original languageEnglish
Article number012033
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - Sep 7 2015
Event29th International Conference on Photonic, Electronic and Atomic Collisions, ICPEAC 2015 - Toledo, Spain
Duration: Jul 22 2015Jul 28 2015


ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Müller, A., Borovik, A., Buhr, T., Hellhund, J., Holste, K., Kilcoyne, A. L. D., Klumpp, S., Martins, M., Ricz, S., Viefhaus, J., & Schippers, S. (2015). Observation of four-electron Auger processes. Journal of Physics: Conference Series, 635(1), [012033]. https://doi.org/10.1088/1742-6596/635/1/012033