Figure 2: U LIII-edge EXAFS spectra and models.
From: Biogenic non-crystalline U(IV) revealed as major component in uranium ore deposits
(a) Magnitude of Fourier transform spectra are offset for clarity for following depths (from top to bottom in m-bgs): 191.0, 193.8, 194.0, 194.4 and 196.0. (b,c) Real part of Fourier transform of the sediments from depths 191.0 m (b) and 196 m (c). The components of the model are shown offset beneath the total model (i.e., Oax, O1, C, Oxalate, U and O2). Contributions from Oax: axial oxygen atoms from uranyl (UVI); O1, O2: oxygen atoms bound to U(VI) and U(IV) at a longer distance than U-Oax C: carbon atoms from bidentate carbon group; Oxalate: oxalate-like ligand group; U: U neighbours in uraninite are shown in B. EXAFS spectra (symbols) and models (lines).
