Structure and diffusion of Pd clusters on the W(1 1 0) surface

Tsu Yi Fu, Yi Ju Hwang, T. T. Tsong

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Fundamental to an atomistic understanding of many surface phenomena is how atoms and small atomic clusters behave on the surface and what energies are involved in various atomic processes. Using the field ion microscope, we have measured diffusion parameters of small Pd clusters with two to nine Pd atoms on the W(110) surface. The average activation energy of the center of mass diffusion increases with the number of Pd atoms in the clusters. From the probability of observing different atomic configurations during diffusion, possible cluster diffusion mechanisms are probed. A small Pd cluster can form either a one-dimensional (1D) linear-chain or a two-dimensional island-like structure. The stability of linear chains remains until the number of atoms reaches eight. From the probability of observing different structures approaching thermal equilibrium, we discuss the importance of many body effects in the adatom-adatom interaction.

Original languageEnglish
Pages (from-to)143-148
Number of pages6
JournalApplied Surface Science
Volume219
Issue number1-2
DOIs
Publication statusPublished - 2003 Oct 15

Keywords

  • Adatom-adatom interaction
  • Cluster
  • Diffusion
  • Field ion microscopy
  • Palladium
  • Tungsten

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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