On the Influence of Steps on the Rotational Anisotropy of the Second Harmonic Generation from Ag Electrodes

The second harmonic generation (SHG) from stepped Ag(111) based surfaces in an electrolyte solution have been measured and analyzed. The rotational anisotropies from these surfaces show a pronounced effect due to the lowering of the surface symmetry relative to a (111) surface. The results from the stepped surfaces are interpreted in terms of a pseudo mirror plane. The SH response has also been measured during the underpotential deposition (UPD) of lead onto the stepped crystals and the results are compared to the well known Ag(111)/Pb2+ system. The SH response during adsorption on defect and terrace sites on Ag(111) are monitored separately and the contribution from the steps to the SH anisotropy is discussed.

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