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BibTeX file of [Roerig22a] [show it without abstract] @conference{Roerig22a, author={Aljoscha R{\"o}rig and Thomas M. Baumann and Benjamin Erk and Markus Ilchen and Joakim Laksman and Valerija Musi{\'c} and Shashank Pathak and Daniel E. Rivas and Daniel Rolles and Svitozar Serkez and Sergey Usenko and Philipp Schmidt and Tommaso Mazza and Robin Santra and Michael Meyer and Sang-Kil Son and Rebecca Boll}, title={Multiple-core-hole resonance spectroscopy with ultraintense X-ray pulses}, year={2022}, month={September 19-23}, booktitle={Science at FELs}, institution={DESY and European XFEL}, address={Hamburg, Germany}, keywords={XATOM; European XFEL; CFEL; DESY;}, url={www.desy.de/scienceatfels2022}, abstract={A joint theoretical and experimental effort will be presented that studies the multiphoton dynamics of xenon leading to multiple-core-hole states and extreme high charge states (up to Xe$^{41+}$) after interaction with soft X-ray FEL pulses as a function of the photon energy. The experiment was carried out at the Small Quantum Systems (SQS) scientific instrument at the European XFEL. Isolated xenon atoms were irradiated with ultraintense, femtosecond soft X-ray pulses, scanning the photon energy over a range of 1 keV (700--1700 eV) in 25-eV steps while upholding a constant number of photons per pulse on target (up to 1$\times$10$^{13}$) throughout the entire scan. To interpret the experimental data and to elucidate the underlying ionisation mechanisms, ab initio calculations of the ionisation dynamics were done using the XATOM toolkit. We created so-called resonance profiles consisting of the photon-energy-dependent, theoretical or experimental ion yields of a specific charge state and showing the importance of multiple-core-hole states after resonant multiphoton absorption. Moreover, we observed ion yields saturating after a sufficiently high fluence (number of photons per unit area), which was the first time glancing into this high fluence regime. Generally, the fluence mainly shapes the charge-state distribution (CSD) at a given photon energy. The fluence independence, on the contrary, made it possible to study the influence of the hard-to-grasp pulse duration or other FEL beam parameters on the CSD.} } Aljoscha Rörig, Thomas M. Baumann, Benjamin Erk, Markus Ilchen, Joakim Laksman, Valerija Musić, Shashank Pathak, Daniel E. Rivas, Daniel Rolles, Svitozar Serkez, Sergey Usenko, Philipp Schmidt, Tommaso Mazza, Robin Santra, Michael Meyer, Sang-Kil Son, and Rebecca Boll, Multiple-core-hole resonance spectroscopy with ultraintense X-ray pulses in Science at FELs (DESY and European XFEL, Hamburg, Germany, September 19-23, 2022) ![[abstract]](/biblio/img/abstract.gif) [abstract]![[link]](/biblio/img/link.gif) [link]
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