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- W3080118858 endingPage "12535" @default.
- W3080118858 startingPage "12518" @default.
- W3080118858 abstract "K-fluorescence X-ray emission spectroscopy (XES) is receiving growing interest in all fields of natural sciences to investigate the local spin. The spin sensitivity in Kβ (Kα) XES stems from the exchange interaction between the unpaired 3p (2p) and the 3d electrons, which is greater for Kβ than for Kα. We present a thorough investigation of a large number of iron-bearing compounds. The experimental spectra were analyzed in terms of commonly used quantitative parameters (Kβ1,3-first moment, Kα1-full width at half-maximum, and integrated absolute difference -IAD-), and we carefully examined the difference spectra. Multiplet calculations were also performed to elucidate the underlying mechanisms that lead to the chemical sensitivity. Our results confirm a strong influence of covalency on both Kβ and Kα lines. We establish a reliable spin sensitivity of Kβ XES as it is dominated by the exchange interaction, whose variations can be quantified by either Kβ1,3-first moment or Kβ-IAD and result in a systematic difference signal line shape. We find an exception in the Kβ XES of Fe3+ and Fe2+ in water solution, where a new difference spectrum is identified that cannot be reproduced by scaling the exchange integrals. We explain this by strong differences in orbital mixing between the valence orbitals. This result calls for caution in the interpretation of Kβ XES spectral changes as due to spin variations without a careful analysis of the line shape. For Kα XES, the smaller exchange interaction and the influence of other electron-electron interactions make it difficult to extract a quantity that directly relates to the spin." @default.
- W3080118858 created "2020-09-01" @default.
- W3080118858 creator A5016213646 @default.
- W3080118858 creator A5022890892 @default.
- W3080118858 creator A5053987524 @default.
- W3080118858 creator A5072636854 @default.
- W3080118858 date "2020-08-24" @default.
- W3080118858 modified "2023-10-17" @default.
- W3080118858 title "Chemical Sensitivity of Kβ and Kα X-ray Emission from a Systematic Investigation of Iron Compounds" @default.
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- W3080118858 doi "https://doi.org/10.1021/acs.inorgchem.0c01620" @default.