The Role of Nuclear Coulomb Attraction in Nonsequential Double Ionization of Argon Atom

TL;DR

This study investigates how nuclear Coulomb attraction influences nonsequential double ionization of argon atoms, using classical simulations to match experimental data and analyze electron dynamics.

Contribution

It demonstrates that adjusting nuclear Coulomb potential in classical models accurately reproduces experimental spectra and reveals detailed electronic dynamics, highlighting atom species effects.

Findings

Reproduces experimental momentum spectra accurately

Shows nuclear Coulomb attraction is crucial in recollision dynamics

Highlights atom species influence on ionization processes

Abstract

The role of nucleus in strong-field nonsequential double ionization of Ar atoms is investigated using three-dimensional classical ensembles. By adjusting the nuclear Coulomb potential, we can excellently reproduce the experimental correlated electron and ion momentum spectra with laser intensities above the recollision threshold [Phys. Rev. Lett. 93, 263001 (2004)] and below the recollision threshold [Phys. Rev. Lett. 101, 053001 (2008)] quantitatively. Analysis reveals the detailed electronic dynamics when the nuclear Coulomb attraction plays a key role in the recollision process of nonsequential double ionization of Ar atoms. Comparison between our results for Ar and those for He shows that atom species have a strong influence on nonsequential double ionization.