Non-sequential double ionization below laser-intensity threshold: Anticorrelation of electrons without excitation of parent ion

Abstract

Two-electron correlated spectra of non-sequential double ionization below laser-intensity threshold are known to exhibit back-to-back scattering of the electrons, viz., the anticorrelation of the electrons. Currently, the widely accepted interpretation of the anticorrelation is recollision-induced excitation of the ion plus subsequent field ionization of the second electron. We argue that another mechanism, namely simultaneous electron emission, when the time of return of the rescattered electron is equal to the time of liberation of the bounded electron (the ion has no time for excitation), can also explain the anticorrelation of the electrons in the deep below laser-intensity threshold regime. Our conclusion is based on the results of the numerical solution of the time-dependent Schrödinger equation for a model system of two one-dimensional electrons as well as an adiabatic analytic model that allows for a closed-form solution.

6 pages and 3 figures

References in corpus (7)

• Non-Sequential Double Ionization is a Completely Classical Photoelectric Effect
• In-plane Theory of Non-Sequential Triple Ionization
• Classical Effects of Laser Pulse Duration on Strong-field Double Ionization
• Instantaneous Multiphoton Ionization Rate and Initial Distribution of Electron Momenta
• Quantum interference in laser-induced nonsequential double ionization in diatomic molecules: the role of alignment and orbital symmetry
• Two-electron ionization in strong laser fields below intensity threshold: signatures of attosecond timing in correlated spectra
• Adaptation of the Modified Adiabatic Approximation to Strong Field Ionization