Coupled interface plasmons of the Ag-Si(111) system as investigated with high-resolution electron energy-loss spectroscopy
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Superstructure
Electron spectroscopy
High resolution electron energy loss spectroscopy (HREELS) is a powerful method for the study of vibrational and electronic excitations at solid surfaces and has been extensively applied to metal single crystal surfaces. As a result of experimental difficulties, unfortunately, much less information is available on adsorbate vibrations at oxide surfaces. This review focuses on recent results showing the successful application of HREELS to study adsorption and reaction of molecules on metal oxide single crystal surfaces. The chemical reactivity of perfect surfaces is first investigated systematically using HREELS combined with thermal desorption spectroscopy (TDS) and low energy electron diffraction (LEED). Furthermore, it is demonstrated that the interaction of adsorbates with surface defects (in particular oxygen vacancies) can also be monitored by vibrational spectroscopy.
Thermal desorption spectroscopy
Low-energy electron diffraction
Electron spectroscopy
Crystal (programming language)
Reactivity
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A few years ago, High Resolution Electron Energy Loss Spectroscopy (HREELS) - also named electron induced vibrational spectroscopy - has been successfully applied to characterize the composition and geometrical structure of polymer surfaces. In this review, the attributes of HREELS will be demonstrated and compared to the ones of other surface-sensitive spectroscopies. Special emphasis will be laid on the very unique information that can be obtained from the study of the incipient metallization stages of a well-defined polymer, i.e. a cured polyimide film.
Electron spectroscopy
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A study by integrated Auger electron spectroscopy, electron energy-loss spectroscopy (EELS), and high-resolution low-energy electron energy loss spectroscopy (HREELS) has been performed on the oxidation of copper silicides, which had been formed by electron beam vapor deposition of Cu onto Si(100) and Si(111) surfaces at 293 K. The splitting of the 92-eV (L2,3VV) silicon Auger intensity peak during increasing copper coverage and with oxidation at 295 K is analyzed in detail. The oxidation process is furthermore investigated by EELS and HREELS through an analysis of the changes in the fine-structure electron energy-loss spectra. An enhanced oxidation due to a catalytic interaction of Cu upon the surface electronic structure is found apparently to be due to an increased production of surface SiO species at the initial stages. No Cu–O bond was detected.
Auger electron spectroscopy
Electron spectroscopy
Energy-dispersive X-ray spectroscopy
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Wave vector
Spatial dispersion
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Surface phonon
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Monochromator
Electron spectrometer
Electron spectroscopy
Energy-dispersive X-ray spectroscopy
Valence electron
Auger electron spectroscopy
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The reaction of Al deposited on Sb(111) was studied by high-resolution electron-energy-loss spectroscopy. The formation of AlSb was confirmed by the observation of the surface optical phonon of the compound at 332 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ (41 meV). A quantitative interpretation of the AlSb/Sb interface formation is proposed, based on the dielectric theory of electron-energy-loss spectroscopy.
Electron spectroscopy
Energy-dispersive X-ray spectroscopy
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Electron spectroscopy
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New experimental studies of surface vibrational properties of materials with high-resolution electron energy loss spectroscopy (EELS) are reported. This document summarizes recent progress on surface phonon dispersion measurements on copper (001); silver (001) and (111); oxygen adsorption on ultrathin films of cobalt and nickel; aluminum on silicon (111); and copper-oxide based superconductors.
Surface phonon
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