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The reaction of ThCl 4 and HN 3 aqueous solution yielded the Th 3+ (aq) ion which was identified by its absorption (UV-vis, 200-1300 nm) and ESR spectra. In the high energy region of the electronic spectrum just below 650 nm, a significant and constant signal occurs until 420 nm (maximum at 460 nm), which sees the onset of a very intense, broad band with maxima at ca...
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