The influence of random oxygen adsorption on the surface dynamics of Ni(100)
TL;DR: In this paper, the authors investigated the effect of random oxygen adsorption on the frequency of the surface phonons of Ni(100) and showed that only minor effects are observed in case of disordered adsoreption.
About: This article is published in Surface Science.The article was published on 1985-11-02. It has received None citations till now. The article focuses on the topics: Adsorption & Surface phonon.
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TL;DR: In this paper, low-energy electron diffraction spectra for Ni(001) were calculated for O, S, Se, and Te on Ni(1) and showed good agreement with experiment for fourfold coordinated bonding sites and displacements from the center of the first layer of nickel atoms.
Abstract: Calculated low-energy electron diffraction spectra for $c(2\ifmmode\times\else\texttimes\fi{}2)$ overlayer structures of O, S, Se, and Te on Ni(001) show very good agreement with experiment for fourfold coordinated bonding sites and displacements of 0.90, 1.30, 1.45, and 1.90 \ifmmode\pm\else\textpm\fi{} 0.1 \AA{}, respectively, from the center of the first layer of nickel atoms. These adsorbate-atom locations correspond to Ni-chalcogen bond lengths smaller than occur in bulk compounds, but comparable to those found in divalent Ni-chelate complexes.
248 citations
TL;DR: An Auger variant of the x-ray-absorption fine-structure (EXAFS) technique has been successfully applied to study the adsorption site and adsorbate-substrate bond length in a single-crystal system as discussed by the authors.
Abstract: An Auger variant of the x-ray-absorption fine-structure (EXAFS) technique has been successfully applied to study the adsorption site and adsorbate-substrate bond length in a single-crystal system. The surface-EXAFS technique should have widespread applications in surface crystallographic studies.
166 citations
TL;DR: Mesure de la dispersion de phonon en surface le long de la direction Γ-X and comparaison avec les modeles theoriques as mentioned in this paper, et.
Abstract: Mesure de la dispersion de phonon en surface le long de la direction Γ-X et comparaison avec les modeles theoriques
166 citations
TL;DR: In contrast to recent theoretical electronic structure calculations and analysis of electron energy-loss spectra, surface extended-x-ray-absorption fine-structure measurements establish the local structural equivalence of $p(2\ifmmode\times\else\texttimes\fi{}2)$ and $c(2
Abstract: In contrast to recent theoretical electronic structure calculations and analysis of electron energy-loss (ELS) spectra, surface extended-x-ray-absorption fine-structure measurements establish the local structural equivalence of $p(2\ifmmode\times\else\texttimes\fi{}2)$ and $c(2\ifmmode\times\else\texttimes\fi{}2)$ oxygen on Ni(100). In both cases the oxygen atoms chemisorb in the fourfold hollow site with an O-Ni bond length of 1.96 \ifmmode\pm\else\textpm\fi{} 0.03 \AA{} (i.e., ${d}_{\ensuremath{\perp}}=0.86\ifmmode\pm\else\textpm\fi{}0.07$ \AA{}). In the light of the present results the large ELS frequency shift (14 meV) between the $p(2\ifmmode\times\else\texttimes\fi{}2)$ and $c(2\ifmmode\times\else\texttimes\fi{}2)$ phases remains a puzzle.
102 citations
TL;DR: In this article, high-resolution electron energy loss spectroscopy (EELS) was used to investigate the Vibrational excitations of oxygen and sulphur chemisorbed on Ni(100) in the consecutive p(2 × 2) and c(2× 2) structures.
94 citations