Femtosecond electronic structure response to high intensity XFEL pulses probed by iron X-ray emission spectroscopy
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Univ. Rennes (France)
- Paul Scherrer Institute (PSI), Villigen (Switzerland)
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- European XFEL, Schenefeld (Germany)
- ShanghaiTech University (China)
- Beijing Normal University (China)
We report the time-resolved femtosecond evolution of the K-shell X-ray emission spectra of iron during high intensity illumination of X-rays in a micron-sized focused hard X-ray free electron laser (XFEL) beam. Detailed pulse length dependent measurements revealed that rapid spectral energy shift and broadening started within the first 10 fs of the X-ray illumination at intensity levels between 1017 and 1018 W cm-2. We attribute these spectral changes to the rapid evolution of high-density photoelectron mediated secondary collisional ionization processes upon the absorption of the incident XFEL radiation. These fast electronic processes, occurring at timescales well within the typical XFEL pulse durations (i.e., tens of fs), set the boundary conditions of the pulse intensity and sample parameters where the widely-accepted ‘probe-before-destroy’ measurement strategy can be adopted for electronic-structure related XFEL experiments.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- Contributing Organization:
- SLAC National Accelerator Laboratory, Menlo Park, CA-94025, USA. Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes. France. SwissFEL, Paul Scherrer Institute, 5232 Villigen, Switzerland Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany. European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany High Pressure for Science & Technology Advanced Research, Shanghai 201203, China Department of Physics and Applied Optics Beijing Area Major Laboratory, Center for Advanced Quantum Studies, Beijing Normal University, Beijing 100875, China
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1671331
- Alternate ID(s):
- OSTI ID: 1769046
- Journal Information:
- Scientific Reports, Vol. 10, Issue 1; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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