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Journal Article PUBDB-2023-04604
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Electron Population Dynamics in Resonant Non-Linear X-ray Absorption in Nickel at a Free-Electron Laser

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2023
AIP Publishing LLC Melville, NY

Structural dynamics 10(5), 054501 () [10.1063/4.0000206] special issue: "The advent of ultrafast X-ray absorption spectroscopy"
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Report No.: arXiv:2211.17008

Abstract: Free-electron lasers provide bright, ultrashort, and monochromatic X-ray pulses, enabling novel spectroscopic mea-surements not only with femtosecond temporal resolution: The high fluence of their X-ray pulses can also easily enterthe regime of non-linear X-ray-matter interaction. Entering this regime necessitates a rigorous analysis and reliableprediction of the relevant non-linear processes for future experiment designs. Here we show non-linear changes in theL3-edge absorption of metallic nickel thin films, measured with fluences up to 60 J/cm2. We present a simple but pre-dictive rate model that quantitatively describes spectral changes based on the evolution of electronic populations withinthe pulse duration. Despite its simplicity, the model reaches good agreement with experimental results over more thanthree orders of magnitude in fluence, while providing a straightforward understanding of the interplay of physical pro-cesses driving the non-linear changes. Our findings provide important insights for the design and evaluation of futurehigh-fluence free-electron laser experiments, and contribute to the understanding of non-linear electron dynamics inX-ray absorption processes in solids at the femtosecond timescale.

Classification:
Contributing Institute(s):
  1. FS-FLASH (FS-FLASH)
  2. The European XFEL Users (XFEL-User)
  3. SCS (XFEL_E2_SCS)
  4. FS-SXQM (FS-SXQM)
  5. FS-Photon Science (FS-PS)
  6. Strukturdynamik Chemischer Systeme (FS-SCS)
Research Program(s):
  1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
  2. VH-NG-1105 - Novel soft X-ray spectroscopies for materials science (2016_IVF-VH-NG-1105) (2016_IVF-VH-NG-1105)
  3. DFG project 278162697 - SFB 1242: Nichtgleichgewichtsdynamik kondensierter Materie in der Zeitdomäne (278162697) (278162697)
  4. FS-Proposal: I-20160880 (I-20160880) (I-20160880)
Experiment(s):
  1. SCS: Spectroscopy & Coherent Scattering (SASE3)
  2. XFEL Beamline SASE 3 (XFEL)

Appears in the scientific report 2023
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Medline ; Creative Commons Attribution CC BY 4.0 ; DOAJ ; OpenAccess ; Article Processing Charges ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Essential Science Indicators ; Fees ; IF < 5 ; JCR ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection
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Private Collections > >XFEL.EU > XFEL_E2_SCS
Private Collections > >XFEL.EU > XFEL-User
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Electron Dynamics at High-Energy Densities in Nickel from Non-linear Resonant X-ray Absorption Spectra
[10.3204/PUBDB-2023-01187]  GO OpenAccess  Download fulltext Files  Download fulltextFulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

 Record created 2023-07-31, last modified 2025-07-15
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