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  • 71.55  (1)
  • Oberflächenanalyse  (1)
  • 1
    ISSN: 1432-0630
    Keywords: 71.20 ; 71.55 ; 73
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The electronic properties of Ar-ion and electron bombarded single-crystal surfaces of LiNbO3 have been investigated at room temperature by ultraviolet photoelectron spectroscopy (UPS) and x-ray excited photoelectron spectroscopy (XPS). In crystals reduced in this way, the loss of oxygen is accompanied with a loss of lithium and the creation of Nb4+ and Nb3+ ions. The relative concentrations of the various defects have been determined from their corresponding XPS core line spectra. When surface defects are produced an emission in the region of the bulk band gap appears. This gap emission is identified as arising from Nb 4d electrons due to the reduction of Nb5+ ions to Nb4+ and Nb3+ ions. The different behaviour of the gap emission upon surface treatment in the UPS and the XPS spectra is discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 291 (1978), S. 97-107 
    ISSN: 1618-2650
    Keywords: Oberflächenanalyse ; Spektrometrie, ESCA ; Überblick
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The present state of ESCA (Electron Spectroscopy for Chemical Analysis) is reviewed with emphasis on chemical applications. It is shown that in metals the electron spectra are modified significantly by many body effects, which manifest themselves in an asymmetric lineshape for the core lines and the occurrence of many plasmons. These effects make it difficult to determine concentrations directly from line intensities. Studies of adsorbates on metal surfaces allow conclusions on the nature of the bonding between the surface and adsorbate molecules and the geometric configuration of the adsorbate molecules relative to the surface.
    Notes: Zusammenfassung Der augenblickliche Stand der ESCA (Elektronen-Spektroskopie zur Chemischen Analyse) Spektroskopie wird im Hinblick auf die chemischen Anwendungen dieser Technik beschrieben. Es wird gezeigt, daß in Metallen die Spektren durch Vielteilcheneffekte erheblich verzerrt werden: diese machen sich durch eine asymmetrische Linienform und das Auftreten von Plasmonen bemerkbar. Diese Effekte erschweren die direkte Konzentrationsbestimmung aus Linienintensitäten. Untersuchungen von Adsorbaten auf Metalloberflächen erlauben Rückschlüsse über die Natur der Bindung zwischen den Oberflächen- und Adsorbatmolekülen und über die geometrischen Konfigurationen des Adsorbatmoleküls relativ zur Oberfläche.
    Type of Medium: Electronic Resource
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