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Get Free AccessOxidation-state-specific dynamics at the Fe M-2,M-3-edge are measured on the sub-100 fs time scale using tabletop high-harmonic extreme ultraviolet spectroscopy. Transient absorption spectroscopy of alpha-Fe2O3 thin films after 400 nm excitation reveals distinct changes in the shape and position of the 3p -> valence absorption peak at similar to 57 eV due to a ligand-to-metal charge transfer from 0 to Fe. Semiempirical ligand field multiplet calculations of the spectra of the initial Fe3+ and photoinduced Fe2+ state confirm this assignment and exclude the alternative d-d excitation. The Fe2+ state decays to a long-lived trap state in 240 fs. This work establishes the ability of time-resolved extreme ultraviolet spectroscopy to measure ultrafast charge-transfer processes in condensed-phase systems.
Josh Vura‐Weis, Chang-Ming Jiang, Chong Liu, Hanwei Gao, J. Matthew Lucas, Frank M. F. de Groot, Peidong Yang, Paul Alivisatos, Stephen R. Leone (2013). Femtosecond M<sub>2,3</sub>-Edge Spectroscopy of Transition-Metal Oxides: Photoinduced Oxidation State Change in α-Fe<sub>2</sub>O<sub>3</sub>. , 4(21), DOI: https://doi.org/10.1021/jz401997d.
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Type
Article
Year
2013
Authors
9
Datasets
0
Total Files
0
Language
en
DOI
https://doi.org/10.1021/jz401997d
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