“…After the adsorption of iodide one oxidation state of iodide is detected at 619.9-620.6 eV, which is either I − or I 2 . The expected 3d 5/2 peak of I − in AgI is in the range of 619–619.5 eV and of I 2 in the range of 619.9–620.8 eV [ 55 , 56 ]. However, 3d 5/2 peaks of iodide at 619.3–619.9 and even as high as 623.5 eV have also been reported [ 56 , 57 , 58 ].…”