Abstract
In a previous study we have developed a general theory of chemisorption on certain stepped surfaces; namely those for which a lattice gas in thermodynamic equilibrium is an appropriate model. We showed there that a comparison of LEED (Low Energy Electron Diffraction) results for flat and stepped substrates can determine the change in adsorption energy at terrace edge sites. In the present work we demonstrate this via detailed Monte Carlo calculations for O on a certain stepped W(110) surface. We use oxygen adatom-adatom (AA) interaction energies previously determined by experimental and theoretical studies on flat W(110). By comparison with experimental results for the stepped surface system we find that the O binding energy is less strong at either terrace edge for this particular surface and defect.
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