title: Evidence of single-photon two-site core double ionization of C2H2 molecules.
abstract: We observe the formation in a single-photon transition of two core holes, each at a different carbon atom of the C2H2 molecule. At a photon energy of 770.5 eV, the probability of this 2-site core double ionization amounts to 1.6 ± 0.4% of the 1-site core double ionization. A simple theoretical model based on the knockout mechanism gives reasonable agreement with experiment. Spectroscopy and Auger decays of the associated double core hole states are also investigated.
authors.affiliation: UPMC, Université Paris 06, LCPMR, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France.
authors.forename: P
authors.initials: P
authors.lastname: Lablanquie
authors.forename: T P
authors.initials: TP
authors.lastname: Grozdanov
authors.forename: M
authors.initials: M
authors.lastname: Zitnik
authors.forename: S
authors.initials: S
authors.lastname: Carniato
authors.forename: P
authors.initials: P
authors.lastname: Selles
authors.forename: L
authors.initials: L
authors.lastname: Andric
authors.forename: J
authors.initials: J
authors.lastname: Palaudoux
authors.forename: F
authors.initials: F
authors.lastname: Penent
authors.forename: H
authors.initials: H
authors.lastname: Iwayama
authors.forename: E
authors.initials: E
authors.lastname: Shigemasa
authors.forename: Y
authors.initials: Y
authors.lastname: Hikosaka
authors.forename: K
authors.initials: K
authors.lastname: Soejima
authors.forename: M
authors.initials: M
authors.lastname: Nakano
authors.forename: I H
authors.initials: IH
authors.lastname: Suzuki
authors.forename: K
authors.initials: K
authors.lastname: Ito