title: Stabilization of helium in intense xuv laser fields.
abstract: We investigate the impact of electron-electron correlation on the ionization dynamics of helium in intense, high-frequency laser fields by solving the time-dependent Schrödinger equation from first principles. Although we observe a decrease in the total ionization yield at high field strengths, the hallmark of atomic stabilization, the repulsion between the electrons has a detrimental effect on the degree of stabilization, in particular for short pulses. Investigation of the ion channel yields reveals that the double ionization process is less prone to two-electron effects, and consequently exhibits the most distinct signature of stabilization. We also find that commonly used one-dimensional models tend to overestimate the effect of correlation.
authors.affiliation: Department of Mathematics, University of Bergen, N-5007 Bergen, Norway.
authors.forename: T
authors.initials: T
authors.lastname: Birkeland
authors.forename: R
authors.initials: R
authors.lastname: Nepstad
authors.forename: M
authors.initials: M
authors.lastname: Førre