IRAS studies of the orientation of acetone molecules in monolayer and multilayer films on Au(1 1 1) surfaces

Denis Syomin, Bruce E. Koel

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

We have investigated the interaction of acetone with a Au(1 1 1) surface by use of temperature programmed desorption (TPD) and infrared reflection-absorption spectroscopy (IRAS). We find that acetone reversibly adsorbs on Au(1 1 1), with thermal desorption peaks at 160, 137 and 132 K corresponding to acetone desorption from the monolayer, second layer and multilayer, respectively. IRAS data is used to establish that chemisorbed acetone molecules bind to the Au(1 1 1) surface through the oxygen atom in a η1-(O) configuration with the molecular plane tilted with respect to the surface plane to give C1 symmetry at submonolayer and monolayer coverage. In multilayer films, acetone molecules adopt a highly ordered orientation with the molecular plane perpendicular to the metal surface and the C = O bond nearly parallel to the surface plane to give Cs symmetry.

Original languageEnglish (US)
Pages (from-to)53-60
Number of pages8
JournalSurface Science
Volume498
Issue number1-2
DOIs
StatePublished - Feb 1 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

Keywords

  • Gold
  • Infrared absorption spectroscopy
  • Ketones
  • Thermal desorption
  • Vibrations of adsorbed molecules

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