title: Two-Color Strong-Field Photoelectron Spectroscopy and the Phase of the Phase.
abstract: The presence of a weak second-harmonic field in an intense-laser ionization experiment affects the momentum-resolved electron yield, depending on the relative phase between the ω and the 2ω component. The proposed two-color "phase-of-the-phase spectroscopy" quantifies for each final electron momentum a relative-phase contrast (RPC) and a phase of the phase (PP) describing how much and with which phase lag, respectively, the yield changes as a function of the relative phase. Experimental results for RPC and PP spectra for rare gas atoms and CO_{2} are presented. The spectra demonstrate a rather universal structure that is analyzed with the help of a simple model based on electron trajectories, wave-packet spreading, and (multiple) rescattering. Details in the PP and RPC spectra are target sensitive and, thus, may be used to extract structural (or even dynamical) information with high accuracy.
authors.affiliation: Institut für Physik, Universität Rostock, 18051 Rostock, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Skruszewicz
authors.affiliation: Institut für Physik, Universität Rostock, 18051 Rostock, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Tiggesbäumker
authors.affiliation: Institut für Physik, Universität Rostock, 18051 Rostock, Germany.
authors.forename: K-H
authors.initials: KH
authors.lastname: Meiwes-Broer
authors.affiliation: Institut für Physik, Universität Rostock, 18051 Rostock, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Arbeiter
authors.affiliation: Institut für Physik, Universität Rostock, 18051 Rostock, Germany.
authors.forename: Th
authors.initials: T
authors.lastname: Fennel
authors.affiliation: Institut für Physik, Universität Rostock, 18051 Rostock, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Bauer