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.
Highlights
Electron correlation is the core of attoscience and molecular tomography [1], and is important to the study of electronic motion in chemical reactions
By following the instantaneous momentum distribution of the RII electrons, we find that the Coulomb repulsion between the two RII electrons contributes mainly to the anticorrelation feature, and that the drift momentum is responsible for the correlation feature in the longitudinal momentum distributions
We study the Nonsequential double ionization (NSDI) for Ar atoms irradiated by the laser pulse of 795 nm wavelength
Summary
Electron correlation is the core of attoscience and molecular tomography [1], and is important to the study of electronic motion in chemical reactions. It has been shown that the longitudinal momentum distribution exhibits an anticorrelation feature at lower laser intensities [13,14], but a correlation feature when the laser intensity is higher than the recollision threshold [15] Such a transition is attributed to the quantum tunnelling effect [16,17] or the multiple recollision during the ionization process of the second electron [18,19,20]. We use the TDNE method to study the NSDI of Ar atoms in a linearly polarized laser pulse, and focus on the transition of the longitudinal momentum distribution from anticorrelation to correlation at different laser intensities. By following the instantaneous momentum distribution of the RII electrons, we find that the Coulomb repulsion between the two RII electrons contributes mainly to the anticorrelation feature, and that the drift momentum is responsible for the correlation feature in the longitudinal momentum distributions
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