Zusammenfassung
We have measured the diffusion of CO on flat and stepped Pt(111) surfaces
using the linear optical diffraction method from an adsorbate grating.
Measurements over a wide range of temperatures (133�313 K) and CO
coverages (0.1�0.67 ML) indicate Arrhenius behavior with diffusion
activation energies of 3.0�4.7 kcal/mol and 7.3�7.9 kcal/mol for
flat and stepped surfaces, respectively. Comparisons of our measurements
on flat and stepped (defected) surfaces with previous experiments
by various groups using various techniques resolves several discrepancies
and illustrates the importance of defect-induced effects on variations
in measured diffusion parameters.
Nutzer