High-energy-resolution off-resonant spectroscopy with self-seeded x-ray 
free-electron laser pulses

Sohn, J. H.; Kang, G.; Choi, T.-K.; Lee, G.; Lee, C.; Chun, S. H.; Park, J.; Shin, D.; Cho, B.-I.

doi:10.1063/4.0000243

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High-energy-resolution off-resonant spectroscopy with self-seeded x-ray free-electron laser pulses

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Shin, D.
Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST);
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science,;

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https://doi.org/10.1063/4.0000243
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Citation

Sohn, J. H., Kang, G., Choi, T.-K., Lee, G., Lee, C., Chun, S. H., et al. (2024). High-energy-resolution off-resonant spectroscopy with self-seeded x-ray free-electron laser pulses. Structural Dynamics, 11(2): 024304. doi:10.1063/4.0000243.

Cite as: https://hdl.handle.net/21.11116/0000-000F-227D-F

Abstract

This paper presents the implementation of high-energy-resolution off-resonant spectroscopy (HEROS) measurements using self-seeded x-ray free-electron laser (XFEL) pulses. This study systematically investigated XFEL conditions, including photon energy and accumulated shot numbers, to optimize the measurement efficiency for copper foil samples near the K-edge. The x-ray absorption spectra reconstructed using HEROS were compared with those derived from fluorescence-yield measurements. The HEROS-based spectra exhibited consistent line shapes independent of the sample thickness. The potential application of HEROS to high-temperature copper was also explored. HEROS offers distinct advantages including scan-free measurement of x-ray absorption spectra with reduced core-hole lifetime broadening and self-absorption effects. Using self-seeded XFEL pulses, HEROS facilitates single-shot-based pump–probe measurements to investigate the ultrafast dynamics in various materials and diverse conditions.