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

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2030-2036
Number of pages7
JournalSurface Science
Volume603
Issue number13
DOIs
Publication statusPublished - 2009 Jul 1
Externally publishedYes

Keywords

  • Scanning tunneling microscopy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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