title: Binary and recoil collisions in strong field double ionization of helium.
abstract: We have investigated the correlated momentum distribution of both electrons from nonsequential double ionization of helium in a 800 nm, 4.5 x 10(14 W/cm2 laser field. Using very high resolution coincidence techniques, we find a so-far unobserved fingerlike structure in the correlated electron momentum distribution. The structure can be interpreted as a signature of the microscopic dynamics in the recollision process. We identify features corresponding to the binary and recoil lobe in field-free (e,2e) collisions. This interpretation is supported by analyzing ab initio solutions of a fully correlated three-dimensional helium model.
authors.affiliation: National Research Council, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada. andre.staudte@nrc.ca
authors.forename: A
authors.initials: A
authors.lastname: Staudte
authors.forename: C
authors.initials: C
authors.lastname: Ruiz
authors.forename: M
authors.initials: M
authors.lastname: Schöffler
authors.forename: S
authors.initials: S
authors.lastname: Schössler
authors.forename: D
authors.initials: D
authors.lastname: Zeidler
authors.forename: Th
authors.initials: T
authors.lastname: Weber
authors.forename: M
authors.initials: M
authors.lastname: Meckel
authors.forename: D M
authors.initials: DM
authors.lastname: Villeneuve
authors.forename: P B
authors.initials: PB
authors.lastname: Corkum
authors.forename: A
authors.initials: A
authors.lastname: Becker
authors.forename: R
authors.initials: R
authors.lastname: Dörner