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https://hdl.handle.net/2142/82901
Description
Title
Adatom Diffusion and Interactions: Pd on W(110)
Author(s)
Koh, Seong Jin
Issue Date
1998
Doctoral Committee Chair(s)
Ehrlich, Gert
Department of Study
Materials Science and Engineering
Discipline
Materials Science and Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Language
eng
Abstract
Three-atom interaction energies have been estimated from the observed linear-to-island transformation of Pd clusters and from the measured interaction energies of Pd pairs. In this, three-atom interaction energies corresponding to two different configurations, linear and triangle, have been obtained for the first time. It has been found that the magnitude of the three-atom interaction energy for the linear configuration, F$\sb{\rm 3,lin}$, is large. The large three-atom interaction energy of the linear configuration is responsible for the observed stability of linear chain structures of small Pd clusters and for the linear-to-island transformation when the size of the cluster increases. This study has shown that many-atom interactions play a crucial role in the cohesion and structure of nuclei in the early stages of crystal growth and hence significantly influence the entire growth process.
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