Fritz-Haber-Institut der Max-Planck-Gesellschaft  

Chemical Physics - Spectroscopy Group
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Microscopic reaction steps on well-defined oxide surfaces

The studies are usually performed under UHV conditions using well-defined oxide substrates as models for real catalytic systems. Oxide surfaces may exhibit a notable complexity:

  • Structure and stoichiometry depend on temperature and oxygen pressure.
  • Reactions at the surface can change the stoichiometry and the structure.
  • Different types of defect states may be present.
  • Polar surfaces may exhibit complex electrostatic stabilization mechanisms.
Typical research activities involve the characterization of the surface properties and the investigation of their role for reactions at the surface. Many studies are performed in co-operation with theory groups which is important in order to establish a consistent model.

For our investigations we employ a number of experimental methods:

  • High Resolution Electron Energy Loss Spectroscopy (HREELS) with an energy resolution of down to 1 meV and Infrared Reflection Absorption Spectroscopy (IRAS) for the investigation of vibrational and electronic excitations.
  • Electron Energy Loss Spectroscopy (EELS) with medium energy resolution for the study of electronic excitations.
  • Near Edge X-ray Absorption Fine Structure (NEXAFS), X-ray Photoemission Spectroscopy (XPS), and Angular Resolved Ultraviolet Photoelectron Spectroscopy (ARUPS) with synchrotron light and laboratory sources for the study of electronic properties, stoichiometry, oxidation states and adsorbate geometry.
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Fri, 13. Jan 2012
Address: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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