INVESTIGADORES
BULNES fernando manuel
artículos
Título:
Energetic Topography Effects on Surface Diffusion
Autor/es:
F. BULNES; F. NIETO; V. PEREYRA; G. ZGRABLICH; C. UEBING
Revista:
LANGMUIR
Editorial:
American Chemical Society
Referencias:
Lugar: USA; Año: 1999 vol. 15 p. 5990 - 5996
ISSN:
0743-7463
Resumen:
The chemical diffusion coefficient D for non-interacting particles on heterogeneous surfaces with different energetic topographies is studied by Monte Carlo simulation. Two kinds of topographies are considered: strongly correlated patches and weakly correlated amorphous surfaces. Topography effects are clearly identified in the absence of competing adsorbate-adsorbate interactions. These effects are strong and depend on the trap-barrier feature and on the spatial correlation length for adsorptive energy. The dependence of D on the temperature T does not follow, in general the Arrhenius law. The ratio of diffusion coefficients at surface coverages near 1 and near 0, D(full coverage)/D(zero coverage) appears as a useful tool to characterize the energetic topography.
