Collective vibrational modes of the high-density (1 × 1)-O phase on Ru(001)

  • Moritz T
  • Menzel D
  • Widdra W
  • 4

    Readers

    Mendeley users who have this article in their library.
  • 12

    Citations

    Citations of this article.

Abstract

High-resolution electron energy-loss spectroscopy (HREELS) has been used to investigate the vibrational properties of the newly discovered, well-ordered oxygen (1 × 1) overlayer on Ru(001). The totally symmetric Ru-O stretch has been mapped out along the Γ̄-K̄-M̄-K̄direction of the surface Brillouin zone (SBZ). The stretching mode exhibits a strong downward dispersion of about 100 cm-1along Γ̄-K̄ starting at 660 cm-1, with a subsequent upward dispersion along K̄-M̄. The dispersion observed for small k∥is explained by dominating long-range dynamical dipole-dipole coupling. From comparisons of experimental data in the vicinity of the Γ̄ point with calculations for dipole-dipole coupling, the frequency of the isolated oscillator (singleton frequency), as well as the vibrational and electronic polarizabilities, can be estimated to be 598 cm-1, 0.8 angstrom3and 1.7 angstrom3, respectively. However, the short-range interactions deviate significantly from dynamical dipole-dipole interactions as is documented by the discrepancy between the calculated and the observed dispersion between K̄ and M̄.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free