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Vibrational measurements of Na/Ni(111) and (Na + CO)/Ni(111)

Abstract

The vibrational properties of Na atoms and of Na coadsorbed with CO on Ni(111) have been studied by high-resolution electron energy loss spectroscopy. Loss measurements showed a significant weakening of the alkali–substrate bond as a function of the alkali coverage. Moreover, we found that coadsorbed CO molecules dramatically influence the vibrational properties of Na adatoms. The Na–Ni stretching frequency (22 meV) measured on the Na/Ni(111) system shifted down to 13 meV for the (Na + CO)/Ni(111) surface. This unexpected result was ascribed to a charge transfer from Na to CO. Present findings give new insights on the nature of the alkali–substrate and alkali–CO bond.

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Correspondence to A. Politano.

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Politano, A., Agostino, R.G., Colavita, E. et al. Vibrational measurements of Na/Ni(111) and (Na + CO)/Ni(111). J Mater Sci 43, 3447–3451 (2008). https://doi.org/10.1007/s10853-007-2281-7

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  • DOI: https://doi.org/10.1007/s10853-007-2281-7

Keywords

  • Loss Measurement
  • Electronic Polarizability
  • Vibrational Property
  • Alkali Atom
  • Substrate Bond