Multielectron effect in strong-field ionization of CO

TL;DR

This paper explores how multielectron polarization influences photoelectron momentum distributions during strong-field ionization of CO, revealing effects caused by induced dipole potential and Stark shifts through numerical and semiclassical models.

Contribution

It introduces a combined numerical and semiclassical approach to analyze multielectron effects in CO ionization, highlighting the role of induced dipole potential and Stark shifts.

Findings

Altered asymmetry and interference patterns in momentum distributions.

Identification of the induced dipole potential's influence on electron dynamics.

Demonstration of the combined effect of dipole force and Stark shift on ionization.

Abstract

We investigate the effects of the multielectron polarization of the ion described by the induced dipole potential in photoelectron momentum distributions produced in ionization of the CO molecule by a strong laser field. We present results of the numerical solution of the time-dependent Schr\"{o}dinger equation in three spatial dimensions and semiclassical simulations accounting for quantum interference. We predict the change of the asymmetry and interference patterns in two-dimensional photoelectron momentum distributions as well as longitudinal momentum distributions. By using a semiclassical model we identify the mechanism responsible for the observed effects. It is shown that the modifications of electron momentum distributions are caused by a combined effect of the force acting on photoelectrons due to the induced dipole potential and the linear Stark-shift of the ionization potential.