### 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 language | English |
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Pages (from-to) | 143-148 |

Number of pages | 6 |

Journal | Applied Surface Science |

Volume | 219 |

Issue number | 1-2 |

DOIs | |

Publication status | Published - 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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## Cite this

*Applied Surface Science*,

*219*(1-2), 143-148. https://doi.org/10.1016/S0169-4332(03)00596-8