title: Electron scattering at steps: image-potential states on Cu(119).
abstract: The dynamics of image-potential states on Cu(119) have been studied with two-photon photoemission. Direction-dependent quasielastic scattering processes with large momentum transfer are attributed to the finite terrace-width distribution on the stepped surface. This effectively couples image-potential states via interband scattering and leads to an asymmetry of the decay rate. Electrons in the first image-potential state live apparently longer when running upstairs.
authors.affiliation: Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany.
authors.forename: Manfred
authors.initials: M
authors.lastname: Roth
authors.forename: Martin
authors.initials: M
authors.lastname: Pickel
authors.forename: Wang
authors.initials: W
authors.lastname: Jinxiong
authors.forename: Martin
authors.initials: M
authors.lastname: Weinelt
authors.forename: Thomas
authors.initials: T
authors.lastname: Fauster