Abstract
The influence of adsorbed on the local formation scheme of Pb adsorption at stepped Ag(111) substrates and on substrate-adsorbate transformation phenomena of the incomplete Pb coverage has been investigated by voltammetric methods, in situ scanning tunneling microscopy (STM) imaging and linescan techniques in a comparative study in without with and with The step-wise formation scheme of the Pb adsorbate formation, observed previously in the absence of is maintained in the presence of but the potential intervals in the Pb adsorption range associated with the distinct formation stages undergo increasing narrowing and overlap with increasing concentration. The rate of the substrate-adsorbate transformation phenomena of an incomplete Pb monolayer, leading to the formation of a surface alloy with a structure, decreases markedly with increasing concentration, and is restricted in the presence of to the outermost peripherical borders of the atomic terraces. On the other hand, coalescence phenomena of monatomic pits, observed at the Pb-adsorbate free Ag substrate after surface alloy formation and subsequent complete Pb desorption, are significantly accelerated by increase of the concentration, presumably due to a -induced enhancement of the rate of Ag surface diffusion. © 2004 The Electrochemical Society. All rights reserved.
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