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Femtosecond X-ray Absorption Spectroscopy at a Hard X-ray Free Electron Laser: Application to Spin Crossover Dynamics

  • Henrik T. Lemke
  • , Christian Bressler
  • , Lin X. Chen
  • , David M. Fritz
  • , Kelly J. Gaffney
  • , Andreas Galler
  • , Wojciech Gawelda
  • , Martin Kristoffer Haldrup
  • , Robert W. Hartsock
  • , Hyotcherl Ihee
  • , Jeongho Kim
  • , Kyung Hwan Kim
  • , Jae Hyuk Lee
  • , Martin Meedom Nielsen
  • , Andrew B. Stickrath
  • , Wenkai Zhang
  • , Diling Zhu
  • , Marco Cammarata
  • SLAC National Accelerator Laboratory
  • European XFEL
  • Argonne National Laboratory
  • Korea Basic Science Institute
  • Korea Advanced Institute of Science and Technology
  • Inha University

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

X-ray free electron lasers (XFELs) deliver short (<100 fs) and intense (similar to 10(12) photons) pulses of hard X-rays, making them excellent sources for time-resolved studies. Here we show that, despite the inherent instabilities of current (SASE based) XFELs, they can be used for measuring high-quality X-ray absorption data and we report femtosecond time-resolved X-ray absorption near-edge spectroscopy (XANES) measurements of a spin-crossover system, iron(II) tris(2,2'-bipyridine) in water. The data indicate that the low-spin to high-spin transition can be modeled by single-exponential kinetics convoluted with the overall time resolution. The resulting time constant is similar to 160 fs.
Original languageEnglish
JournalJournal of Physical Chemistry A
Volume117
Issue number4
Pages (from-to)735-740
ISSN1089-5639
DOIs
Publication statusPublished - 2013

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