title: Variable time lag and backward ejection in full-dimensional analysis of strong-field double ionization.
abstract: Ensembles of 400,000 two-electron trajectories in three space dimensions are used with Newtonian equations of motion to track atomic double ionization under very strong laser fields. We report a variable time lag between e-e collision and double ionization, and find that the time lag plays a key role in the emergence directions of the electrons. These are precursors to production of electron momentum distributions showing substantial new agreement with experimental data.
authors.affiliation: Department of Physics and Astronomy, Calvin College, Grand Rapids Michigan 49546, USA. haan@calvin.edu
authors.forename: S L
authors.initials: SL
authors.lastname: Haan
authors.forename: L
authors.initials: L
authors.lastname: Breen
authors.forename: A
authors.initials: A
authors.lastname: Karim
authors.forename: J H
authors.initials: JH
authors.lastname: Eberly