期刊
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
卷 188, 期 -, 页码 166-171出版社
ELSEVIER
DOI: 10.1016/j.elspec.2012.09.012
关键词
Molecular switching; Time-resolved spectroscopy; X-ray spectroscopy; Spin transition; Photoinduced transition; Ultrafast phenomena; Pump-probe experiments
类别
资金
- European Research Council [ERC-StG-259709]
- German research community (DFG) [SFB925]
- European CRISP project
- European XFEL
- Hungarian Scientific Research Fund (OTKA) [K 72597]
- U.S. Department of Energy (DOE) Office of Science, Division of Chemical, Geological and Biological Sciences [DE-AC02-06CH11357]
- U.S. DOE [DE-AC02-06CH11357]
- Danish National Research Foundation
- DANSCATT
- Swedish Research Council
We report on extending hard X-ray emission spectroscopy (XES) along with resonant inelastic X-ray scattering (RIXS) to study ultrafast phenomena in a pump-probe scheme at MHz repetition rates. The investigated systems include low-spin (LS) Fe-II complex compounds, where optical pulses induce a spin-state transition to their (sub)nanosecond-lived high-spin (HS) state. Time-resolved XES clearly reflects the spin-state variations with very high signal-to-noise ratio, in agreement with HS-LS difference spectra measured at thermal spin crossover, and reference HS-LS systems in static experiments, next to multiplet calculations. The 1s2p RIXS, measured at the Fe Is pre-edge region, shows variations after laser excitation, which are consistent with the formation of the HS state. Our results demonstrate that X-ray spectroscopy experiments with overall rather weak signals, such as RIXS, can now be reliably exploited to study chemical and physical transformations on ultrafast time scales. (C) 2012 Elsevier B.V. All rights reserved.
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