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K-edge XAS of 0.1M Cu(ClO4)2 in 1M HClO4 aqueous solution in (blue solid line) liquid (ambient temperature) and (red solid line) frozen (10 K) phase. Inset (a): The bound-state energy region of the same Cu(II) K-edges, and the unique 8989.6 eV shoulder (arrow) in the frozen solution XAS. Inset (b): Disparity of the XAS spectra continues throughout the continuum energy region.
