Deposition and diffusion of size-selected (Ag400+) clusters on a stepped graphite surface |
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| Authors: | S.J. Carroll R.E. Palmer P.A. Mulheran S. Hobday R. Smith |
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| Affiliation: | (1) Nanoscale Physics Research Laboratory, School of Physics and Astronomy, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK, UK;(2) Department of Physics, University of Reading, Whiteknights, P.O. Box 220, Reading RG6 6AF, UK, UK;(3) Department of Mathematical Sciences, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK, UK |
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| Abstract: | 400 clusters on a stepped graphite surface by a combination of scanning electron microscopy experiments and computer simulations (molecular dynamics and Monte Carlo methods). We find that the shape of the clusters is only partially deformed by the impact with the surface, moreover the clusters do not create surface defects upon landing, and so are able to diffuse freely over the surface. Many clusters are found to become trapped at surface steps, where their mobility is reduced by the higher binding energy. Exploring the 1-D diffusion of clusters along the steps reveals the low mobility for larger islands, as well as the importance of defects on the step (for example kinks), which trap the mobile clusters. Received: 9 April 1998/Accepted: 25 August 1998 |
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| Keywords: | PACS: 36.40.Sx 61.46.+w |
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