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

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

Research output: Contribution to journalArticle

15 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

Fingerprint

Chemical reactions
vibration mode
chemical reactions
Molecules
Water
water
excitation
molecules
dissociation
Electrons
electron energy
Electron tunneling
electron tunneling
Hydroxyl Radical
Desorption
Microscopes
desorption
microscopes
Scanning
Atoms

Keywords

  • Scanning tunneling microscopy

ASJC Scopus subject areas

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

Cite this

Chemical reactions of water molecules on Ru(0 0 0 1) induced by selective excitation of vibrational modes. / Mugarza, Aitor; Shimizu, Tomoko; Frank Ogletree, D.; Salmeron, Miquel.

In: Surface Science, Vol. 603, No. 13, 01.07.2009, p. 2030-2036.

Research output: Contribution to journalArticle

Mugarza, Aitor ; Shimizu, Tomoko ; Frank Ogletree, D. ; Salmeron, Miquel. / Chemical reactions of water molecules on Ru(0 0 0 1) induced by selective excitation of vibrational modes. In: Surface Science. 2009 ; Vol. 603, No. 13. pp. 2030-2036.
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