title: Double core-hole production in N2: beating the Auger clock.
abstract: We investigate the creation of double K-shell holes in N2 molecules via sequential absorption of two photons on a time scale shorter than the core-hole lifetime by using intense x-ray pulses from the Linac Coherent Light Source free electron laser. The production and decay of these states is characterized by photoelectron spectroscopy and Auger electron spectroscopy. In molecules, two types of double core holes are expected, the first with two core holes on the same N atom, and the second with one core hole on each N atom. We report the first direct observations of the former type of core hole in a molecule, in good agreement with theory, and provide an experimental upper bound for the relative contribution of the latter type.
authors.affiliation: Physics Department, Western Michigan University, Kalamazoo, Michigan 49008, USA. lifang@slac.stanford.edu
authors.forename: L
authors.initials: L
authors.lastname: Fang
authors.forename: M
authors.initials: M
authors.lastname: Hoener
authors.forename: O
authors.initials: O
authors.lastname: Gessner
authors.forename: F
authors.initials: F
authors.lastname: Tarantelli
authors.forename: S T
authors.initials: ST
authors.lastname: Pratt
authors.forename: O
authors.initials: O
authors.lastname: Kornilov
authors.forename: C
authors.initials: C
authors.lastname: Buth
authors.forename: M
authors.initials: M
authors.lastname: Gühr
authors.forename: E P
authors.initials: EP
authors.lastname: Kanter
authors.forename: C
authors.initials: C
authors.lastname: Bostedt
authors.forename: J D
authors.initials: JD
authors.lastname: Bozek
authors.forename: P H
authors.initials: PH
authors.lastname: Bucksbaum
authors.forename: M
authors.initials: M
authors.lastname: Chen
authors.forename: R
authors.initials: R
authors.lastname: Coffee
authors.forename: J
authors.initials: J
authors.lastname: Cryan
authors.forename: M
authors.initials: M
authors.lastname: Glownia
authors.forename: E
authors.initials: E
authors.lastname: Kukk
authors.forename: S R
authors.initials: SR
authors.lastname: Leone
authors.forename: N
authors.initials: N
authors.lastname: Berrah
mesh_terms: D004583:Electrons; D007834:Lasers; D009584:Nitrogen; D056951:Photoelectron Spectroscopy; D055585:Physical Phenomena; D011789:Quantum Theory; D017356:Synchrotrons; D014965:X-Rays
chemical_list: D009584:Nitrogen