Journal article
Femtosecond X-ray Absorption Spectroscopy at a Hard X-ray Free Electron Laser: Application to Spin Crossover Dynamics
SLAC National Accelerator Laboratory1
European XFEL2
Argonne National Laboratory3
Department of Physics, Technical University of Denmark4
Neutrons and X-rays for Materials Physics, Department of Physics, Technical University of Denmark5
Korea Basic Science Institute6
Inha University7
Korea Advanced Institute of Science and Technology8
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.
| Language: | English |
|---|---|
| Publisher: | American Chemical Society (ACS) |
| Year: | 2013 |
| Pages: | 735-740 |
| ISSN: | 15205215 and 10895639 |
| Types: | Journal article |
| DOI: | 10.1021/jp312559h |
| ORCIDs: | Haldrup, Martin Kristoffer and Nielsen, Martin Meedom |
