A STUDY OF THE DIFFUSION OF PbON THE Au(111) SURFACE BY STM AND EAM-MD SIMULATIONS

M. C. Robinson, A. J. Slavin and K. de'bell
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M. C. Robinson: Trent University and Queen's University, Ontario, Canada
A. J. Slavin: Trent University and Queen's University, Ontario, Canada
K. de'bell: University of New Brunswick, New Brunswick, Canada

Surface Review and Letters (SRL), 1999, vol. 06, issue 05, 793-800

Abstract: Surface reconstructions often result in novel growth morphologies, and are therefore of potential technological interest. The Au(111) surface will reconstruct into the$22\times \sqrt{3}$"herringbone" structure. Low coverages (up to 0.3 monolayers) have been studied with scanning tunneling microscopy (STM) at room temperature, to determine the impact of the reconstruction on diffusion and thin film growth. The same system has been studied using embedded-atom model molecular dynamics (EAM-MD). These simulations, in addition to providing morphological information, permit qualitative comparison of diffusion phenomena. Experimental results indicate that initial sites for Pb adsorption are located at the herringbone kinks. For higher coverages, Pb prefers hcp and fcc stacking regions, avoiding the herringbone ridges. The reconstruction is removed for some coverage between 0.05 and 0.2 monolayers. STM and EAM results will be compared.

Date: 1999
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DOI: 10.1142/S0218625X99000810

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