Theory and Simulation of Transient Absorption in Warm Dense Matter Created by an X-Ray Free-Electron Laser

ORAL

Abstract

The understanding of warm dense matter (WDM) is important in many fields, including planetary science, inertial confinement fusion, and astrophysics. Although recent advances in experimental techniques using x-ray free electron lasers have led to probes of WDM at extreme temperature- and time-scales, theoretical interpretations of these out of equilibrium states of matter are only now being developed. Here we describe an approach for theoretical simulations of x-ray absorption in XFEL generated warm dense copper based on the combination of a kinetic Boltzmann equation model and finite-temperature real-space Green's function theory. Calculations of the L3 near edge spectra reproduce the main features and trends of recent experimental data [1], including a transition from reverse-saturable to saturable absorption over a wide range of ultra-short fs duration x-ray pulse intensities. The interpretation of these results links features in the spectra to a combination of core- and valence-level shifts, band narrowing, and changes in the photoelectron inelastic mean free path that result from depletion of the 3d band with increased pulse intensities.

*We acknowledge European XFEL in Schenefeld, Germany, for provision of X-ray free electron laser beamtime at Scientific Instrument SCS (Spectroscopy and Coherent Scattering). This work is partly supported by the Cluster of Excellence 'CUI: Advanced Imaging of Matter' of the Deutsche Forschungsgemeinschaft (DFG) - EXC 2056 - project ID 390715994. B.Z. and M.S. thank the European XFEL and the Institute of Nuclear Physics,Polish Academy of Sciences in Krakow for the support in the framework of a joint R&D project. J.J.K. and J.J.R. are supported by the Theory Institute for Materials and Energy Spectroscopies (TIMES) at SLAC funded by the U.S. DOE, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DEAC02-76SF0051.

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Publication: Laurent Mercadier, Andrei Benediktovitch, Spela Krusic et al. Transient Absorption of Warm Dense Matter Created by an X-Ray Free-Electron Laser, 16 January 2023, PREPRINT (Version 1) available at Research Square [https://doi.org/10.21203/rs.3.rs-2396961/v1]

Presenters

  • Joshua J Kas

    • University of Washington

Authors

  • Joshua J Kas

    • University of Washington

  • John J Rehr

    • University of Washington

  • Laurent Mercadier

    • European XFEL
    • European XFEL, 22869 Schenefeld, Germany

  • Andrei Benediktovitch

    • Center for Free-Electron Laser Science CFEL, 9 10 Deutsches Elektronen-Synchrotron DESY, 11 Notkestr. 85, 22607 Hamburg, Germany

  • Sˇpela Kruˇsiˇ

    • Joˇzef Stefan Institute, 1000 Ljubljana, Slovenia

  • Justine Schlappa

    • European XFEL
    • European XFEL, 22869 Schenefeld, Germany

  • Marcus Ag˚aker

    • Department of Physics and Astronomy, Uppsala University, 14 15 P.O. Box 516, SE-751 20 Uppsala, Sweden

  • Robert Carley

    • European XFEL
    • European XFEL, 22869 Schenefeld, Germany

  • Giuseppe Fazio

    • Laboratorium fu¨r Physikalische Chemie, ETH Zu¨rich, 8093 Zu¨rich, Switzerland

  • Natalia Gerasimova

    • European XFEL, 22869 Schenefeld, Germany

  • Young Kim

    • European XFEL, 22869 Schenefeld, Germany

  • Loic L Guyader

    • European XFEL, 22869 Schenefeld, Germany

  • Giuseppe Mercurio

    • European XFEL, 22869 Schenefeld, Germany
    • European XFEL

  • Sergii Parchenko

    • European XFEL, 22869 Schenefeld, Germany

  • Jan-Erik Rubensson

    • Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden

  • Svitozar Serkez

    • European XFEL, 22869 Schenefeld, Germany

  • Michal Stransky

    • European XFEL, 22869 Schenefeld, Germany

  • Martin Teichmann

    • European XFEL
    • European XFEL, 22869 Schenefeld, Germany

  • Zhong Yin

    • European XFEL, 22869 Schenefeld, Germany

  • Matjaˇz ˇZitnik

    • Joˇzef Stefan Institute, 1000 Ljubljana, Slovenia

  • Andreas Scherz

    • European XFEL
    • European XFEL, 22869 Schenefeld, Germany

  • Beata Ziaja-Motyka

    • Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany

  • Nina R Rohringer

    • Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany