Abstract
The Au(110) surface in electrochemical environment (0.1 M Na2SO4 solution) has been studied by in situ reflectance anisotropy spectroscopy (RAS) and by in situ scanning tunneling microscopy (STM). Three ranges of applied potential could be determined: negative potential (≈ —0.6 V vs. Ag/AgCl) where a clear (1 × 3) reconstruction is obtained; positive potential (≈0.6 V) where the surface is unreconstructed; and intermediate potential where the surface displays both mixed (1 × 3) and (1 × 2) domains. The significant differences in the RAS curves for the differently reconstructed Au(110) surfaces are attributed both to the local-field effect acting on the interband transitions at the surface, and to the changes of free electron relaxation time in the [001] direction (perpendicular to the atomic rows) due to different corrugations of the surface.
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