Corresponding to OPD Systems The Formation of Surface Alloys

From Fig. 13 it also follows that kink sites are not filled before step decoration, but instead both processes take place simultaneously. Furthermore, as pointed out above, configuration 14 is 

For the systems Au/Ag, Pt/Ag, Pd/Au, and Pt/Au, adsorbate atoms diffuse into the islands, forming an alloy, while the islands tend to disintegrate. This fact is illustrated in Fig. 14 for Pt deposition on Ag(lOO) and in Fig. 15 for the system Pt/Au(100). At low coverage degrees, the adatoms start to be embedded into the islands, and even form small nuclei. This proeess continues and upon completion of the monolayer, the substrate islands have ineorporated an important number of adatoms. 

While the simplicity of the present model, which, among others, neglects surface reconstruction, anion adsorption, and specific kinetic features, does not allow a quantitative comparison with experiments, qualitative predictions can be made concerning surface alloy formation in the presence of islands. 

Comparison between the predictions of Monte Carlo simulations for the formation of surface alloys in the presence of islands of substrate atoms and experimental observations. (Reprinted from Ref [16], with permission from the the American Chemical Society.) 

System Surface alloy prediction E q)erimei]tal observation 

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