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MO: Fachverband Molekülphysik
MO 15: Interaction with VUV and X-ray Light I (joint session A/MO)
MO 15.5: Vortrag
Mittwoch, 12. März 2025, 12:00–12:15, GrHS Mathe
Single-shot electron spectroscopy of highly transient matter — •Sara Savio1, Lars Funke1, Niclas Wieland2, Thorsten Otto3, Lasse Wuelfing1, Markus Ilchen2,3, and Wolfram Helml1 — 1Technische Universitaet — 2University of Hamburg — 3Deutsches Elektronen-Synchrotron
Core-level photoionization is the process of absorbing a photon by an atom or molecule, ejecting an electron from one of its inner shells and creating a vacancy. This vacancy is then filled through various relaxation processes, which can lead to the emission of secondary electrons or energy redistribution within the system. We explore the generation of double-core holes (DCH) in gaseous neon atoms, which have a very short lifetime, using intense and ultrashort pulses on the attosecond scale at the European XFEL. The ultrafast electron dynamics are mapped on a single-shot basis using an electron time-of-flight (eTOF)spectrometer. Non-invasive systematic pulse characterization using the angular streaking technique provides spectral and temporal information about the ionizing XFEL pulses with attosecond resolution. We conduct a comprehensive study of how the contribution of DCH channels varies with beam parameters, including pulse duration, pulse energy, and the centres of the reconstructed spectra. Examining the electronic structure of the core-ionized system before relaxation, combined with the detailed information about the ionizing pulse, provides valuable insights into the nonlinear photoabsorption and the ultrafast process at extreme intensities on the time scales of electron dynamics.
Keywords: Auger decay; single-shot; photo-electron spectroscopy; transient state; ultrafast electron dynamics