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Ultrafast photoionization dynamics at high laser intensities in the xuv regime

Title data

Kaiser, Benjamin ; Vagov, Alexei ; Axt, Vollrath M. ; Pietsch, U.:
Ultrafast photoionization dynamics at high laser intensities in the xuv regime.
In: Physical Review A. Vol. 84 (2011) Issue 4 . - Art.Nr. 043431, 9 S..
ISSN 0556-2791
DOI: https://doi.org/10.1103/PhysRevA.84.043431

Project information

Project financing: Bundesministerium für Bildung und Forschung

Abstract in another language

We study the ionization dynamics in the soft-x-ray regime for high intensities and short pulses for excitations near the ionization threshold. Using a one-dimensional helium atom model, we compare exact numerical solutions with time-dependent Hartree-Fock results in order to identify the role of electron-electron correlations. At moderate intensities but still in the x-ray and short-pulse regime, we find that the Hartree-Fock theory reproduces well the dynamics of the ground-state occupation, while at high intensities strong correlation effects occur for excitations close to the threshold. From their characteristic momentum distributions, we can identify contributions to the double ionization from sequential three-photon and nonsequential or sequential two-photon processes. At elevated intensities these contributions deviate from their usual intensity scaling due to saturation effects, even though the total double-ionization probability stays below 10%. Furthermore, analysis of the time evolution of the momentum distribution reveals signatures of the energy-time uncertainty which indicate a coherent regime of the dynamics.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: photoionization; ultrafast dynamics; high intensities; xuv; soft-x-ray; electron-electron correlations; double ionization; sequential three-photon and two-phonon processes; nonsequential ionization; energy-time uncertainty; coherent regime
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 30 Oct 2017 15:02
Last Modified: 30 Oct 2017 15:02
URI: https://eref.uni-bayreuth.de/id/eprint/40232