Chemical reactions of water molecules on Ru(0 0 0 1) induced by selective excitation of vibrational modes

Aitor Mugarza, Tomoko K. Shimizu, D. Frank Ogletree, Miquel Salmeron

研究成果: Article査読

17 被引用数 (Scopus)

抄録

Tunneling electrons in a scanning tunneling microscope were used to excite specific vibrational quantum states of adsorbed water and hydroxyl molecules on a Ru(0 0 0 1) surface. The excited molecules relaxed by transfer of energy to lower energy modes, resulting in diffusion, dissociation, desorption, and surface-tip transfer processes. Diffusion of H2O molecules could be induced by excitation of the O-H stretch vibration mode at 445 meV. Isolated molecules required excitation of one single quantum while molecules bonded to a C atom required at least two quanta. Dissociation of single H2O molecules into H and OH required electron energies of 1 eV or higher while dissociation of OH required at least 2 eV electrons. In contrast, water molecules forming part of a cluster could be dissociated with electron energies of 0.5 eV.

本文言語English
ページ(範囲)2030-2036
ページ数7
ジャーナルSurface Science
603
13
DOI
出版ステータスPublished - 2009 7月 1
外部発表はい

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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