title: Transition of correlated-electron emission in nonsequential double ionization of Ar atoms.
abstract: Emission of the two electrons released from nonsequential double ionization of argon atoms is anticorrelated at lower laser intensities but is correlated at higher laser intensities. Such a transition is caused by the momentum change of recollision-induced-ionization (RII) electrons. At lower laser intensities, the Coulomb repulsion between the two RII electrons dominates the motion of electrons and pushes them leaving the laser field back-to-back. At higher laser intensities, the drift momentum obtained from the laser field dominates the motion of electrons and drives them leaving the laser field side-by-side.
authors.forename: Zilong
authors.initials: Z
authors.lastname: Zhang
authors.forename: Jingtao
authors.initials: J
authors.lastname: Zhang
authors.forename: Lihua
authors.initials: L
authors.lastname: Bai
authors.forename: Xu
authors.initials: X
authors.lastname: Wang