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Femtosecond X-ray absorption spectroscopy at a hard X-ray free electron laser: application to spin crossover dynamics.

Abstract : X-ray free electron lasers (XFELs) deliver short (<100 fs) and intense (∼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 ∼160 fs.
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https://hal.archives-ouvertes.fr/hal-00803672
Contributor : Muriel Cadieu <>
Submitted on : Friday, March 22, 2013 - 3:21:03 PM
Last modification on : Tuesday, January 12, 2021 - 4:39:30 PM

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Henrik T. Lemke, Christian Bressler, Lin X Chen, David M Fritz, Kelly J Gaffney, et al.. Femtosecond X-ray absorption spectroscopy at a hard X-ray free electron laser: application to spin crossover dynamics.. Journal of Physical Chemistry A, American Chemical Society, 2013, 117 (4), pp.735-40. ⟨10.1021/jp312559h⟩. ⟨hal-00803672⟩

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