title: Resonance Effects in Photoemission Time Delays.
abstract: We present measurements of single-photon ionization time delays between the outermost valence electrons of argon and neon using a coincidence detection technique that allows for the simultaneous measurement of both species under identical conditions. The analysis of the measured traces reveals energy-dependent time delays of a few tens of attoseconds with high energy resolution. In contrast to photoelectrons ejected through tunneling, single-photon ionization can be well described in the framework of Wigner time delays. Accordingly, the overall trend of our data is reproduced by recent Wigner time delay calculations. However, besides the general trend we observe resonance features occurring at specific photon energies. These features have been qualitatively reproduced and identified by a calculation using the multiconfigurational Hartree-Fock method, including the influence of doubly excited states and ionization thresholds.
authors.affiliation: Physics Department, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Sabbar
authors.affiliation: Physics Department, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Heuser
authors.affiliation: Physics Department, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Boge
authors.affiliation: Physics Department, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Lucchini
authors.affiliation: Laboratoire de Chimie Quantique et Photophysique, CP160/09, Université Libre de Bruxelles, B 1050 Brussels, Belgium.|Physics Department, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden.
authors.forename: T
authors.initials: T
authors.lastname: Carette
authors.affiliation: Physics Department, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden.
authors.forename: E
authors.initials: E
authors.lastname: Lindroth
authors.affiliation: Physics Department, ETH Zurich, 8093 Zurich, Switzerland.|Institute of Applied Physics, University of Bern, 3012 Bern, Switzerland.
authors.forename: L
authors.initials: L
authors.lastname: Gallmann
authors.affiliation: Physics Department, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Cirelli
authors.affiliation: Physics Department, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: U
authors.initials: U
authors.lastname: Keller