Collision-induced migration of CO on Pt(9 9 7) surface

研究成果: Article査読

5 被引用数 (Scopus)

抄録

Lateral displacement of adsorbates induced by collisions with energy-controlled rare gas atoms was examined in an ultra high vacuum chamber using Fourier-transform infrared (FTIR) spectroscopy and a supersonic molecular beam apparatus. A stepped Pt(9 9 7) surface was exposed to CO molecules and subsequently to energy-controlled Ne or Ar atoms. There was no change in the CO stretching mode region of the FTIR spectrum of the Pt(9 9 7) surface after Ne atoms having an average translational energy of 0.23 eV were collided with it. However, when Ne atoms having an average translational energy of 0.56 eV were collided with the surface, the intensity of the peak assigned to the CO stretching mode at terrace sites decreased, while that at step sites increased with increasing the exposure to the Ne atoms. This is the demonstration of collision-induced migration, showing that CO molecules adsorbed at the terrace sites migrate laterally to the step sites upon collision with high-energy Ne atoms. In addition, the experimental results demonstrate the existence of an additional energy barrier for jumps across the steps. This investigation demonstrates an advantage of using a molecular beam for studying adsorbate migration.

本文言語English
ページ(範囲)1090-1100
ページ数11
ジャーナルSurface Science
601
4
DOI
出版ステータスPublished - 2007 2月 15

ASJC Scopus subject areas

  • 凝縮系物理学
  • 表面および界面
  • 表面、皮膜および薄膜
  • 材料化学

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