Ripening of monolayer vacancy pits on metal surfaces: Pathways, energetics, and size-scaling for Ag(111) versus Ag(100)

TitleRipening of monolayer vacancy pits on metal surfaces: Pathways, energetics, and size-scaling for Ag(111) versus Ag(100)
Publication TypeJournal Article
Year of Publication2007
AuthorsShen MM, Wen JM, Jenks CJ, Thiel PA, Liu DJ, Evans JW
Journal TitlePhysical Review B
Volume75
Pages245409
Date PublishedJun
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000247625000108
Keywords2-DIMENSIONAL ISLANDS, ab-initio, ag islands, brownian-motion, evolution, film, NANOSTRUCTURES, self-diffusion, simulations, STEP
Abstract

Scanning tunneling microscopy studies have revealed that monolayer-deep vacancy pits typically coarsen at 300 K via Smoluchowski ripening (SR) on Ag(111) surfaces and via Ostwald ripening (OR) on Ag(100) surfaces. We elucidate the underlying atomistic processes, the relevant energetics with some input from density functional theory analysis, and also the scaling of the ripening rate with mean pit size. Size scaling for SR reflects the size dependence of the pit diffusion coefficient, so we also discuss observed deviations from classical theories. SR dominates OR for pits on Ag(111) primarily due to its significantly lower effective energy barrier. However, the effective barrier for OR is not lower than that for SR for pits on Ag(100), and one must also account for the distinct size scaling of these pathways to explain the dominance of OR. We also briefly discuss the dependence on temperature of the dominant ripening pathway and the ripening behavior for adatom islands.

DOI10.1103/PhysRevB.75.245409
Alternate JournalPhys. Rev. B