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The tunneling mechanisms in electrochemical STM are studied by distance and voltage tunneling spectroscopy in different model systems. The experimental results indicate an indirect tunneling process via intermediate states. Significant influences of the chemical nature and crystallographic orientation of the substrate and the structure of 2-D upd adlayers on the effective barrier height of the tunneling...
The electrodeposition of Ag on HOPG (0001) substrate is studied using conventional electrochemical methods (cyclic voltammetry, chronoamperometry) and in situ scanning tunnelling microscopy (STM). Due to a weak substrate-deposit interaction the deposition of Ag occurs according to a Volmer-Weber island growth mechanism. At relatively low overpotentials the electrodeposition reaction is mainly initiated...
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