Structure and diffusion mechanism of Ir and Rh tetramers on Ir(0 0 1) surfaces

Tsu Yi Fu*, Tien T. Tsong

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

8 引文 斯高帕斯(Scopus)

摘要

Using the field ion microscope, we observe directly the diffusion behavior of Rh and Ir tetramers on the Ir(001) surface. From the probability of observing different atomic configurations during diffusion, different diffusion mechanisms of Rh and Ir tetramers are investigated and compared. Whether the square shape is more stable than the linear shape or not is the determining factor of the diffusion mechanism. The dimer shearing mechanism [phys. Rev. Lett. 76(1996) 4927] on metal (001) surfaces is energetically favored for systems that the most stable structure is square. For both Ir and Rh tetramers on the Ir(001) surface, the most stable cluster structure is linear shape, but the energy differences between the linear structure and other structures for Rh tetramers are smaller than those for Ir tetramers. The diffusion mechanisms coupled with structure transformation are observed for Rh tetramers on the Ir(001) surface. The effect of the different energy differences is also discussed.

原文英語
頁(從 - 到)1249-1254
頁數6
期刊Surface Science
482-485
發行號PART 2
DOIs
出版狀態已發佈 - 2001

ASJC Scopus subject areas

  • 凝聚態物理學
  • 表面和介面
  • 表面、塗料和薄膜
  • 材料化學

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