Simulation of the life cycle of adsorbate islands on the Pt(100)

MATÍAS RAFTI , JOSE LUIS VICENTE , HANNES UECKER , RONALD IMBIHL

CHEMICAL PHYSICS LETTERS

Elsevier

Lugar: Amsterdam; Año: 2006 vol. 421 p. 577 - 583

0009-2614

Photoemission electron microscopy (PEEM) of the NO + NH3 reaction on a Pt(100) single crystal surface under UHV conditions reveals complicated dynamical behavior. As a rationalization for the observed spatio-temporal evolution of the surface a so-called ?island growth mechanism? was proposed. Here, we present the results of 1D simulations with a realistic 7-variable model that takes explicitly into account macroscopic surface defects on the catalyst. Depending on whether or not we consider site-blocking effects of coadsorbates on diffusing species, we obtain different patterns. The experimental PEEM data can be qualitatively reproduced in this way. reveals complicated dynamical behavior. As a rationalization for the observed spatio-temporal evolution of the surface a so-called ?island growth mechanism? was proposed. Here, we present the results of 1D simulations with a realistic 7-variable model that takes explicitly into account macroscopic surface defects on the catalyst. Depending on whether or not we consider site-blocking effects of coadsorbates on diffusing species, we obtain different patterns. The experimental PEEM data can be qualitatively reproduced in this way. 3 reaction on a Pt(100) single crystal surface under UHV conditions reveals complicated dynamical behavior. As a rationalization for the observed spatio-temporal evolution of the surface a so-called ?island growth mechanism? was proposed. Here, we present the results of 1D simulations with a realistic 7-variable model that takes explicitly into account macroscopic surface defects on the catalyst. Depending on whether or not we consider site-blocking effects of coadsorbates on diffusing species, we obtain different patterns. The experimental PEEM data can be qualitatively reproduced in this way. 2006 Elsevier B.V. All rights reserved.2006 Elsevier B.V. All rights reserved.