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An In-situ Investigation into Structural Ordering on Ag Surfaces during the Underpotential Deposition of Pb Monolayers Using X-ray Absorption Spectroscopy under Conditions of Total External Reflection

The underpotential deposition of a Pb monolayer at -0.525V versus S.C.E. onto a Ag polycrystalline thin film in an electrolyte solution of 0.5M sodium acetate, 5 mM lead acetate and 0.01 M Acetic Acid at 20°C has been examined in-situ using reflectivity EXAFS together with a specially designed electrochemical cell. The data reveal the existence of an Ag-Pb bond length of 2.58Å.