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Femtosecond X-ray Absorption Spectroscopy at a Hard X-ray Free Electron Laser: Application to Spin Crossover Dynamics SCIE SCOPUS
- Title
- Femtosecond X-ray Absorption Spectroscopy at a Hard X-ray Free Electron Laser: Application to Spin Crossover Dynamics
- Authors
- Henrik T. Lemke; Christian Bressler; Lin X. Chen; David M. Fritz; Kelly J. Gaffney; Andreas Galler; Wojciech Gawelda; Kristoffer Haldrup; Robert W. Hartsock; Hyotcherl Ihee; Jeongho Kim; KIM, KYUNG HWAN; Jae Hyuk Lee; Martin M. Nielsen; Andrew B. Stickrath; Wenkai Zhang; Diling Zhu; Marco Cammarata
- Date Issued
- 2013-01-31
- Publisher
- AMER CHEMICAL SOC
- 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.
- ISSN
- 1089-5639
- Article Type
- Article
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY A, vol. 117, no. 4, page. 735 - 740, 2013-01-31
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