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Double-y plot. Right ordinate: (green line) Cu K-edge XANES of 0.10M Cu(ClO4)2 dissolved in liquid aqueous 1M HClO4. Left ordinate: Difference Cu K-edge XAS spectra (liquid aqueous minus frozen glass) for 40% 1,3-propanediol (red line) or 40% 1.5-pentanediol (blue line). The dip at 8984.3 eV in the 1,3-propanediol difference spectrum (red arrow) indicates a trace of Cu(i) from photo-reduction.
