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We studied dynamics of Au (001) surface in situ in 0.1 M HClO4 electrolytesolution using both coherent x-ray scattering and scanning tunneling microscopy(STM). The surface of Au (001) is known to reconstruct at cathodic potentials;the reconstruction lifts at anodic potentials. In our in-situ STM experiments,the measurements focus on time-dependent progressions of surface morphologyduring slow potential sweep. In our in-situ coherent x-ray scatteringmeasurements, we demonstrate that the equilibrium surface dynamics are directlymeasurable and the measured dynamics are consistent with morphologicalevolution of the STM images. These experiments represent the first successfulapplication of coherent x-ray scattering to the study of electrochemicalinterfaces in situ.

Dynamics of Au (001) Surface in Electrolytes: In-Situ Coherent X-ray Scattering and Scanning Tunneling Microscopy