par Kruse, Norbert ;Voss, Christian;Medvedev, Valentyn;Bodenstein, C.;Hanon, D.;Boon, Jean-Pierre
Référence Journal of statistical physics, 101, 1-2, page (621-629)
Publication Publié, 2000-07-11
Article révisé par les pairs
Résumé : Surface catalytic processes produce under :ertain conditions small clusters of adsorbed atoms or groups. called islands which. after they have been formed. move as individual entities. Here we consider the catalylic reduction of NO with hydrogcn on platinum. ( i l Using video field ion microscopy we observe the dynamic motion of small hydroxyl islands on the Pt{OO1) plane: despite changes in their morphology. the islands dimensions are confined to valules corresponding. to 10 to 30 PI atoms suggesting cooperative effects to be in operation (ii) We construct an automaton (or lattice Monte-Carlo ) model on the basis of the set or elementary processes governing the microscopic dynamics . Thc agreement betwteen the simulation results and the experimental observation suggests a possible mechanism for the formation and dynamics of hydroxyl islands.