Anomalous ellipticity dependence in nonsequential double ionization of ArXe

Cheng Huang,Zhengmao Wu,Mingmin Zhong

doi:10.1038/s41598-018-27120-x

Cheng Huang, Zhengmao Wu + Show 1 more

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https://doi.org/10.1038/s41598-018-27120-x

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Journal: Scientific Reports	Publication Date: Jun 8, 2018
Citations: 10	License type: open-access

Affiliation: Southwest University

Abstract

Using a three-dimensional classical ensemble method, we present a theoretical study of nonsequential double ionization of ArXe dimer aligned along the minor axis of the elliptically polarized laser pulse. Numerical results show that NSDI probability firstly increases and then decreases with the laser ellipticity increasing, which is different from atoms. Moreover, the correlated electron momentum spectra from elliptical polarization are always asymmetric, and the asymmetry is enhanced as the ellipticity increases. Analysis backward in time indicates that in NSDI of ArXe aligned along the minor axis the recollision occurs via a semi-elliptical trajectory.

Highlights

Nonsequential double ionization (NSDI)[1,2] is one of the most fundamental processes in intense laser-atoms/molecules interactions
We explore the ellipticity dependence of NSDI yield of the molecule aligned along the minor axis of the elliptic field and the electron correlation behavior
Numerical results show that NSDI yield of ArXe dimer aligned along the minor axis firstly increases and gradually decreases with the laser ellipticity increasing, and the correlated electron momentum spectra from the elliptical polarization are asymmetric

Summary

Introduction

Nonsequential double ionization (NSDI)[1,2] is one of the most fundamental processes in intense laser-atoms/molecules interactions. If a target molecule with a large nuclear distance is positioned along the minor axis of the elliptic field, the recollision may occur between the first ionizing electron and the other core in the molecule even if the initial transverse momentum of the first ionizing electron is zero. In this case, NSDI yield may not decrease monotonously as laser ellipticity increases. Numerical results show that NSDI yield of ArXe dimer aligned along the minor axis firstly increases and gradually decreases with the laser ellipticity increasing, and the correlated electron momentum spectra from the elliptical polarization are asymmetric. The single-direction return results in the asymmetry of correlated electron momentum spectrum

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