Abstract
The kinetics of Rh inter-diffusion into a Pt(100) surface was investigated on abrupt interfaces of Rh Pt(100) which were artificially created by thermal evaporation of 0.8 and 1.5 monolayers of Rh on a (5 × 20) reconstructed Pt(100) substrate at 110 K. Deposition of a small amount of Rh on a clean and reconstructed Pt(100) surface destroys the reconstruction and yields a (1 × 1) structure. The kinetics of Rh diffusion from the overlayer into the bulk was monitored by Auger electron intensities of the Rh and Pt signals as a function of time and annealing temperature. The activation energies of inter-diffusion are derived to be 1.63 ± 0.4 and 1.68 ± 0.2 eV for 0.8 and 1.5 monolayer coverages, respectively.
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