DEPOSITION OF AU ON A SULFUR COVERED MO(100) SURFACE - ADSORBATE ADSORBATE INTERACTION AND GROWTH

Gold was deposited on a clean and on a sulfided Mo(001) surface to stu dy the initial stages of growth and the influence of chemisorbed layer s. On the clean surface, Au forms a c(2 X 2) structure at low coverage s. At coverages above half of a monolayer more complicated structures are revealed by low energy electron diffraction and scanning tunneling microscopy. On the sulfided surface, Au was found to bind directly to the metal by displacing the S to a higher coverage structure. At sulf ur saturation Au forms three-dimensional clusters separated by areas c overed by sulfur in the highest coverage structure.