title: Probing single-photon ionization on the attosecond time scale.
abstract: We study photoionization of argon atoms excited by attosecond pulses using an interferometric measurement technique. We measure the difference in time delays between electrons emitted from the 3s(2) and from the 3p(6) shell, at different excitation energies ranging from 32 to 42 eV. The determination of photoemission time delays requires taking into account the measurement process, involving the interaction with a probing infrared field. This contribution can be estimated using a universal formula and is found to account for a substantial fraction of the measured delay.
authors.affiliation: Department of Physics, Lund University, P.O. Box 118, 22100 Lund, Sweden.
authors.forename: K
authors.initials: K
authors.lastname: Klünder
authors.forename: J M
authors.initials: JM
authors.lastname: Dahlström
authors.forename: M
authors.initials: M
authors.lastname: Gisselbrecht
authors.forename: T
authors.initials: T
authors.lastname: Fordell
authors.forename: M
authors.initials: M
authors.lastname: Swoboda
authors.forename: D
authors.initials: D
authors.lastname: Guénot
authors.forename: P
authors.initials: P
authors.lastname: Johnsson
authors.forename: J
authors.initials: J
authors.lastname: Caillat
authors.forename: J
authors.initials: J
authors.lastname: Mauritsson
authors.forename: A
authors.initials: A
authors.lastname: Maquet
authors.forename: R
authors.initials: R
authors.lastname: Taïeb
authors.forename: A
authors.initials: A
authors.lastname: L'Huillier