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American Chemical Society, The Journal of Physical Chemistry A, 4(117), p. 735-740, 2013

DOI: 10.1021/jp312559h

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

Journal article published in 2013 by Henrik Till Lemke, 김정호, Christian Bressler, Lin X. Chen, David Mark Fritz, Kelly J. Gaffney ORCID, Andreas Galler, Wojciech Gawelda, Kristoffer Haldrup ORCID, Robert W. Hartsock, Hyotcherl Ihee, Jeongho Kim ORCID, Kyung Hwan Kim, Jae Hyuk Lee, Martin Meedom Nielsen and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

X-ray Free Electron Lasers (XFELs) deliver short (<100 femtoseconds) and intense (~1e12 photons) pulses of hard X-rays making them a perfect source for time resolved studies. Here we show that, despite the inherent instabilities of current XFELs, they can be used for measuring high quality X-ray absorption data and we report time-resolved measurements of a spin-crossover system, Iron(II)-tris-(2,2'-bipyridine). The data indicates that the low-spin to high-spin transition can be modelled by single-exponential kinetics convoluted with the overall time resolution. The resulting time constant is 163 +/- 6 fs.