GROWTH MODE AND INTERDIFFUSION OF CO ON PT(111)

Low-energy electron diffraction (LEED) and Auger electron spectroscopy (AES) were used to study the initial growth of a cobalt ultrathin fil m on a Pt(111) surface. The growth of the cobalt ultrathin film on Pt( 111) belongs to Stranski-Krastanov mode. The kinetics of the inter-dif fusion of Co adatoms on a Pt(111) surface was studied by AES at variou s temperatures with the Co coverage of one monolayer. The activation e nergy and the pre-exponential diffusion coefficient are obtained to be 0.90 eV and 6.6 x 10(-11) cm(2)/s respectively from an Arrhenius plot . Ultraviolet photoelectron spectroscopy (UPS) was used to monitor the alloy formation of Co/Pt(111) in the annealing process.