Observation of four-electron Auger processes

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 emphasi...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 635; no. 1; pp. 12033 - 12038
Main Authors Müller, A, Borovik, A, Buhr, T, Hellhund, J, Holste, K, Kilcoyne, A L D, Klumpp, S, Martins, M, Ricz, S, Viefhaus, J, Schippers, S
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 07.09.2015
Subjects
Augers
Autoionization
Decay rate
Ground level
Photon beams
Photons
Physics
Synchrotron radiation
Synchrotrons
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Summary: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.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/635/1/012033