The properties of CO and K coadsorbed on Fd(100) surface

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Abstract

Low energy electron diffraction (LEED) measurements showed a few weak and two sharp patterns (2√2X2√2)R 45° and (√2X√2)R 45° at θK = 0.25 and θK = 0.50 (monolayer), respectively, for the K + CO coadsorbed layer. Preadsorbed potassium markedly increased the activation energy for CO desorption from 128 kJ/mol at θK = 0 to 163 kJ/mol at θK = 0.44 (monolayer). The sticking probability remained constant in the range θK = 0.0-0.30, but radically decreased above this potassium coverage. The work function of the potassium dosed surface (θK = 0.1-0.25) increased sharply following CO adsorption suggesting a high negative charge on CO molecule. A strong electronic interaction between CO and the K/Pd system was also revealed by electron energy loss spectroscopic (EELS) studies. This consisted of a significant decrease in the intensity of the CO loss observed on a clean Pd surface at 12.5-13.0 eV and the simultaneous development of a new loss feature at 24.5-25 eV.

Original languageEnglish
Pages (from-to)2492-2503
Number of pages12
JournalThe Journal of Chemical Physics
Volume90
Issue number4
DOIs
Publication statusPublished - jan. 1 1989

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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