AUTHOR=Wang Jun , Li Gen-Liang , Liu Xiaoyu , Zhu Feng-Zheng , Jiao Li-Guang , Liu Aihua 

TITLE=Photoelectron momentum distribution of hydrogen atoms in a superintense ultrashort high-frequency pulse

JOURNAL=Frontiers in Physics

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.974500

DOI=10.3389/fphy.2022.974500

ISSN=2296-424X

ABSTRACT=By numerically solving the time-dependent Schrodinger equation, the photo-electron momentum distribution of ground state hydrogen atoms in the presence of super-intense ultra-short high-frequency pulses is examined. The photo-electron momentum distribution by a circularly polarized field in a weak laser field is the superposition of two perpendicular linearly polarized fields.
 The photoelectron momentum distribution can be drastically modified by the dynamic interference effect within a super-intense XUV laser field. In this paper, we show that when hydrogen atoms are exposed to a super-intense circularly polarized laser pulse with photon energy $\hbar\omega=53.605$ eV, an obvious dynamic interference pattern occurs, which has previously been observed for linearly polarized pulses or the weakly bounded model H$^-$ system for circularly polarized pulses. For the linear super-intense XUV pulses with equivalent intensity, the angular-distorted interference pattern occurs. The Coulomb re-scattering effect is responsible for the observed substantial variations in photoelectron momentum distributions by linearly and circularly polarized XUV pulses.