Tight-binding model of CO chemisorption on Pd/W (110) and Pt/W (110) surfaces

We study the CO chemisorption on epitaxial Pd and Pt monolayers grown on W (110), by using a simple tight-binding self-consistent recursion method model. The σ donation, π back-donation and the adsorption energy are reduced by the substrate presence. For the atop site above Pd/W (110), however, the situation does not differ much from the chemisorption at the atop position above Pd (111), and this site can be preferred on Pd/W (110) or Pd/Ta (110). Core-level shifts induced on metal atoms by the chemisorption are also discussed.