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

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Lemke, Henrik T. | Bressler, Christian | Chen, Lin X | Fritz, David M | Gaffney, Kelly J | Stickrath, Andrew B | Galler, Andreas | Gawelda, Wojciech | Haldrup, Kristoffer | Hartsock, Robert W | Zhang, Wenkai | Zhu, Diling | Ihee, Hyotcherl | Kim, Jeongho | Kim, Kyung Hwan | Lee, Jae Hyuk | Nielsen, Martin M | Cammarata, Marco

Edité par CCSD ; American Chemical Society -

International audience. 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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