GROWTH OF CU FILMS ON ADSORBATE-COVERED PT(111)

The growth of copper films on Pt(111) covered with a monolayer of benz ene coadsorbed with CO in a 2 root 3 X 5 structure was studied by temp erature programmed desorption (TPD), high resolution electron energy l oss spectroscopy (HREELS), low energy electron diffraction (LEED), and Auger electron spectroscopy (AES). When copper was deposited directly from a hot filament onto the GO-benzene monolayer, the copper displac ed the monolayer and came into direct contact with Pt. However, when a spacer layer of benzene was condensed on top of the monolayer prior t o copper deposition and then thermally removed after the Cu was deposi ted, it was found that Cu formed three-dimensional islands that partia lly displaced the CO-benzene overlayer. At high coverages of Cu, the o verlayer was completely displaced by Cu which could then wet the Pt(11 1) surface.