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MO: Fachverband Molekülphysik

MO 2: Attosecond Physics I (joint session A/MO)

MO 2.6: Talk

Monday, March 11, 2024, 12:15–12:30, HS 1098

Single-shot electron spectroscopy of highly transient matter — •Sara Savio¹, Lars Funke¹, Niclas Wieland^1,3, Lasse Wuelfing¹, Markus Ilchen^2,3, and Wolfram Helml¹ — ¹Fakultät Physik, Technische Universität Dortmund, Maria-Goeppert-Mayer-Straße 2, 44227 Dortmund, Germany — ²Deutsches Elektronen-Synchroton DESY, Notkestr. 85, 22607 Hamburg, Germany — ³University of Hamburg, Middle Way 177 , 20148 Hamburg, Germany

Single-shot electron spectroscopy can be used as a tool to investigate photo-ionization processes and the various subsequent relaxation dynamics, ie how the inner shell vacancies are redistributed and filled in atoms and molecules. This work investigates the generation of double-core holes (DCH) in neon atoms with very short lifetimes using the help of intense and tightly focused X-ray pulses at European XFEL at the attosecond frontier. An electron-time-of-flight (e-TOF) spectrometer equipped with a multi-electrostatic lens system followed by a microchannel plate(MCP) based detector is used to specifically collect DCH Auger electrons in single-shot spectroscopy. The wavelength tunability and high X-ray intensity at European XFEL together with this spectroscopic technique enable the study of highly transient systems. Examining the electronic structure of a core-excited system before relaxation can allow for gaining essential insights into ultrafast processes and nonlinear photoabsorption under extreme intensities thus opening a new field of spectroscopy of transient matter.

Keywords: Auger spectroscopy; double-core hole; single-shot spectroscopy