title: Observation of a four-electron Auger process in near-K-edge photoionization of singly charged carbon ions.
abstract: Single, double, and triple ionization of C(1+) 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 C(1+)(1s2s(2)2p(2) (2)D,(2)P) resonances are found in the triple-ionization channel. The only possible mechanism producing C(4+)(1s(2)) via these resonances is direct triple-Auger decay, i.e., a four-electron process with simultaneous emission of three electrons.
authors.affiliation: Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Müller
authors.affiliation: Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Borovik
authors.affiliation: Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany and Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Buhr
authors.affiliation: Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Hellhund
authors.affiliation: Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Holste
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720-8225, USA.
authors.forename: A L D
authors.initials: AL
authors.lastname: Kilcoyne
authors.affiliation: Institut für Experimentalphysik, Universität Hamburg, 22761 Hamburg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Klumpp
authors.affiliation: Institut für Experimentalphysik, Universität Hamburg, 22761 Hamburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Martins
authors.affiliation: Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany and Institute for Nuclear Research, Hungarian Academy of Sciences, 4001 Debrecen, Hungary.
authors.forename: S
authors.initials: S
authors.lastname: Ricz
authors.affiliation: FS-PE, DESY, 22607 Hamburg, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Viefhaus
authors.affiliation: Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Schippers