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In-situ scanning tunneling microscopy (STM) and cyclic voltammetry have been used to examine chemisorbed Br adlayers on a well-defined Pt(111) surface in a 10 mM KClO 4 solution (pH 4) in the presence of 3 mM KBr. The adlayer structures of the chemisorbed Br were found to be potential dependent. Asymmetric and hexagonal (3 3)-Br ( Br = 0.444) structures were observed at potentials...