Observation of a Four-Electron Auger Process in Near-K-Edge Photoionization of Singly Charged Carbon Ions

Müller, A. and Borovik, A. Jr. and Buhr, T. and Hellhund, J. and Holse, K. and Kilcoyne, A.L.D. and Klumpp, S. and Martins, M. and Ricz, Sándor and Viefhaus, J. and Schippers, S. (2015) Observation of a Four-Electron Auger Process in Near-K-Edge Photoionization of Singly Charged Carbon Ions. PHYSICAL REVIEW LETTERS, 114. pp. 1-5. ISSN 0031-9007

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Abstract

Single, double, and triple ionization of C1þ ions by single photons is investigated in the energy range of 286–326 eV, i.e., in the range from the lowest-energy K-vacancy resonances to well beyond the K-shell ionization threshold. Clear signatures of C1þð1s2s22p2 2D; 2PÞ resonances are found in the triple-ionization channel. The only possible mechanism producing C4þð1s2Þ via these resonances is direct triple-Auger decay, i.e., a four-electron process with simultaneous emission of three electrons.

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