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MO: Fachverband Molekülphysik

MO 17: Poster – Interaction with VUV and X-ray Light (joint session A/MO)

MO 17.1: Poster

Mittwoch, 4. März 2026, 17:00–19:00, Philo 1. OG

Temporal evolution of x-ray fluorescence of highly charged xenon ions under FEL irradiation — •Moritz J. Grunwald-Delitz¹, Thomas M. Baumann¹, Michael Meyer¹, Johan Söderström², and Jan-Erik Rubensson² — ¹European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany — ²Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden

We present the results of x-ray emission spectroscopy (XES) measurements on the interaction of intense x-ray free-electron laser pulses with xenon gas, aiming for a state-resolved exploration of non-linear multiphoton ionization and excitation processes. We utilize the 1D-imaging spectrometer [M. Agåker et al., J. Synchrotron Radiat., 31(5), 2024.] at the SQS instrument of European XFEL and its gas cell sample environment, which allows for studying Xe at a few mbar, a regime where, besides photon-driven processes, electron collisions start to contribute to the highly charged ion and excited state populations. Interestingly, this was not observed during prior studies on neon gas under similar conditions [S.-K. Son et al., Phys. Rev. A, 112(5), 2025, L051101.]. Our measurements monitor the evolution of these contributions over several nanoseconds after the XFEL pulse, revealing a distinct double-peak structure in the time-of-flight distribution.

Keywords: x-ray free-electron laser; x-ray emission spectroscopy; gas phase target; electron collisions; temporal evolution