title: Attosecond time-resolved photoemission from core and valence states of magnesium.
abstract: We report on laser-assisted attosecond photoemission from single-crystalline magnesium. In strong contrast to the previously investigated transition metal tungsten, photoelectron wave packets originating from the localized core level and delocalized valence-band states are launched simultaneously from the solid within the experimental uncertainty of 20 as. This phenomenon is shown to be compatible with a heuristic model based on free-particle-like propagation of the electron wave packets generated inside the crystal by the attosecond excitation pulse and their subsequent interaction with the assisting laser field at the metal-vacuum interface.
authors.affiliation: Physikdepartment E20, Technische Universität München, 85747 Garching, Germany. s.neppl@mytum.de
authors.forename: S
authors.initials: S
authors.lastname: Neppl
authors.forename: R
authors.initials: R
authors.lastname: Ernstorfer
authors.forename: E M
authors.initials: EM
authors.lastname: Bothschafter
authors.forename: A L
authors.initials: AL
authors.lastname: Cavalieri
authors.forename: D
authors.initials: D
authors.lastname: Menzel
authors.forename: J V
authors.initials: JV
authors.lastname: Barth
authors.forename: F
authors.initials: F
authors.lastname: Krausz
authors.forename: R
authors.initials: R
authors.lastname: Kienberger
authors.forename: P
authors.initials: P
authors.lastname: Feulner