Femtosecond X-ray Absorption Spectroscopy at a Hard X-ray Free Electron Laser: Application to Spin Crossover Dynamics
The Journal of Physical Chemistry A2013Vol. 117(4), pp. 735–740
Citations Over TimeTop 1% of 2013 papers
H. Lemke, Christian Bressler, Lin X. Chen, David Fritz, Kelly J. Gaffney, Andreas Galler, Wojciech Gawełda, Kristoffer Haldrup, Robert W. Hartsock, Hyotcherl Ihee, Jeongho Kim, Kyung Hwan Kim, Jae Hyuk Lee, M. Nielsen, Andrew B. Stickrath, Wenkai Zhang, Diling Zhu, Marco Cammarata
Abstract
X-ray free electron lasers (XFELs) deliver short (<100 fs) and intense (∼1012 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 ∼160 fs.
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