title: Two-photon excitation and relaxation of the 3d-4d resonance in atomic Kr.
abstract: Two-photon excitation of a single-photon forbidden Auger resonance has been observed and investigated using the intense extreme ultraviolet radiation from the free electron laser in Hamburg. At the wavelength 26.9 nm (46 eV) two photons promoted a 3d core electron to the outer 4d shell. The subsequent Auger decay, as well as several nonlinear above threshold ionization processes, were studied by electron spectroscopy. The experimental data are in excellent agreement with theoretical predictions and analysis of the underlying multiphoton processes.
authors.affiliation: LIXAM, UMR 8624, CNRS-Université Paris Sud, Bâtiment 350, F-91405 Orsay Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Meyer
authors.forename: D
authors.initials: D
authors.lastname: Cubaynes
authors.forename: V
authors.initials: V
authors.lastname: Richardson
authors.forename: J T
authors.initials: JT
authors.lastname: Costello
authors.forename: P
authors.initials: P
authors.lastname: Radcliffe
authors.forename: W B
authors.initials: WB
authors.lastname: Li
authors.forename: S
authors.initials: S
authors.lastname: Düsterer
authors.forename: S
authors.initials: S
authors.lastname: Fritzsche
authors.forename: A
authors.initials: A
authors.lastname: Mihelic
authors.forename: K G
authors.initials: KG
authors.lastname: Papamihail
authors.forename: P
authors.initials: P
authors.lastname: Lambropoulos