A CRITICAL COMPARISON OF ELECTROCHEMICAL AND SURFACE X-RAY-SCATTERING RESULTS AT THE AU(111) ELECTRODE IN KBR SOLUTIONS

Electrochemical and surface X-ray scattering data are compared for the Au(111) electrode in 0.01 M KBr solution in 0.1 M KClO4 The irreversible peaks in the voltammogram are well correlated with the scattered X-ray intensity from the reconstructed surface in both sweep directions. Surface charge and bromide coverage measured by the chronocoulometric technique are also correlated with the X-ray intensity. The reconstruction lifts over a potential region where the surface charge changes from - 10 to 20 mu C cm(-2) and the bromide coverage increases from 10% to 25% of its saturated coverage.