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Surface resonances in electron reflection from overlayers.

E E Krasovskii1, J Höcker, J Falta

  • 1Departamento de Física de Materiales, Universidad del Pais Vasco UPV/EHU, 20080 San Sebastián/Donostia, Spain. Donostia International Physics Center (DIPC), 20018 San Sebastián/Donostia, Spain. IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 25, 2014
PubMed
Summary
This summary is machine-generated.

Electron scattering reveals sharp resonances on ruthenium surfaces, originating from substrate band structures. This study provides clear evidence for the hexagonal close-packed stacking of oxygen layers on ruthenium.

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Area of Science:

  • Surface Science
  • Condensed Matter Physics
  • Materials Science

Background:

  • Understanding electron interactions with surfaces is crucial for materials science and catalysis.
  • Oxygen adsorption on transition metal surfaces like Ruthenium (Ru) significantly alters surface properties.

Purpose of the Study:

  • To investigate electron scattering phenomena on oxygen-covered Ru(0001) surfaces.
  • To determine the electronic structure and oxygen layer stacking using electron reflection spectroscopy.

Main Methods:

  • Experimental measurement of electron reflection spectra (R(E)) at various oxygen coverages (1/4, 1/2, 3/4, 1 monolayer) on Ru(0001).
  • Theoretical analysis using ab initio scattering theory based on Bloch waves.
  • Investigation of low-energy electron transmission resonances.

Main Results:

  • Observed sharp transmission resonances at low energies attributed to critical points in the Ru substrate's complex band structure.
  • Analyzed reflection spectra R(E) up to 40 eV at normal incidence.
  • Identified surface resonances on reconstructed surfaces (2x1, 2x2) related to secondary diffraction beams.

Conclusions:

  • The study provides unambiguous evidence for hexagonal close-packed (hcp) stacking of oxygen on the Ru(0001) surface.
  • Electron scattering spectroscopy is a powerful tool for elucidating surface structure and electronic properties.