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Figure 3
X-ray induced photoreduction of FeIII, comparing FeIII sulfate (either as hydrated or freeze-dried forms) with FeII sulfate (hydrated) (Experiment 3). (a) Fe K-edge XANES, (b) k3-weighted EXAFS, and (c) derivative of normalized XANES. In (d), a hydrated (frozen) FeIII sulfate sample was scanned at constant energy corresponding to the white line peaks of FeII and FeIII sulfates (7126.1 or 7131.0 eV) for 300 s. At 7126.1 eV, a progressive increase in fluorescence intensity would correspond to the conversion of FeIII to FeII (and vice versa), while at 7131.0 eV, a progressive increase in fluorescence intensity would correspond to the conversion of FeII to FeIII (and vice versa).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 4| July 2019| Pages 1272-1279
https://doi.org/10.1107/S1600577519004351
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