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The 19 F isotropic chemical shifts (δ iso ) of two isomorphic compounds, NbF 5 and TaF 5 , which involve six nonequivalent fluorine sites, have been experimentally determined from the reconstruction of 1D 19 F MAS NMR spectra. In parallel, the corresponding 19 F chemical shielding tensors have been calculated using the GIPAW method for both experimental...
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