期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 117, 期 4, 页码 735-740出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp312559h
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资金
- Danish National Research Foundation's Centre for Molecular Movies
- DANSCATT
- IBS (Institute for Basic Science) [CA1201]
- Creative Research Initiatives (Center for Time-Resolved Diffraction) of MEST/NRF in Korea
- Inha University Research Grant [INHA-46438]
- AMOS program within the Chemical Sciences, Geosciences, and Biosciences Division of the Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy
- European XFEL
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-AC02-06CH11357]
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS CA1301] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [R31-2012-000-10071-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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