title: Correlated two-electron momentum spectra for strong-field nonsequential double ionization of He at 800 nm.
abstract: We report on a kinematically complete experiment on nonsequential double ionization of He by 25 fs 800 nm laser pulses at 1.5 PW/cm;{2}. The suppression of the recollision-induced excitation at this high intensity allows us to address in a clean way direct (e,2e) ionization by the recolliding electron. In contrast with earlier experimental results, but in agreement with various theoretical predictions, the two-electron momentum distributions along the laser polarization axis exhibit a pronounced V-shaped structure, which can be explained by the role of Coulomb repulsion and typical (e,2e) kinematics.
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Rudenko
authors.forename: V L B
authors.initials: VL
authors.lastname: de Jesus
authors.forename: Th
authors.initials: T
authors.lastname: Ergler
authors.forename: K
authors.initials: K
authors.lastname: Zrost
authors.forename: B
authors.initials: B
authors.lastname: Feuerstein
authors.forename: C D
authors.initials: CD
authors.lastname: Schröter
authors.forename: R
authors.initials: R
authors.lastname: Moshammer
authors.forename: J
authors.initials: J
authors.lastname: Ullrich