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Updated: Jun 19, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
Probing electron correlation via attosecond xuv pulses in the two-photon double ionization of helium
J Feist1, S Nagele, R Pazourek
1Institute for Theoretical Physics, Vienna University of Technology, 1040 Vienna, Austria, EU. johannes.feist@tuwien.ac.at
Abstract:
Recent experimental developments of high-intensity, short-pulse extreme ultraviolet light sources are enhancing our ability to study electron-electron correlations. We perform time-dependent calculations to investigate the so-called "sequential" regime (variant Planck's over 2piomega > 54.4 eV) in the two-photon double ionization of helium. We show that attosecond pulses allow us not only to probe but also to induce angular and energy correlations of the emitted electrons. The final momentum distribution reveals regions dominated by the Wannier ridge breakup scenario and by postcollision interaction.
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