The group is very active in the field of surface science, which contains topics relevant to heterogeneous catalysis, materials science and interactions at interfaces. Main techniques used to address such questions are photoelectron spectroscopy, x-ray absorption spectroscopy and other surface sensitive methods.

enlarge the image: Picture of the molecular beam apparatus (Denecke Group)
Picture of the molecular beam apparatus (Denecke Group)

Research projects

Wavelength Dispersive X-Ray Fluorescence Spectroscopy (WD-XRF) enables the qualitative and quantitative elemental analysis of solid and liquid materials. With the spectrometer at hand, all elements with atom numbers greater than five (from carbon) can be detected. This method is used in cooperation with other institutes such as the Institute for Chemical Technology (industrial glasses, rice husk ash, diatomite and catalysts) or the Institute for Mineralogy, Crystallography and Materials Science (ancient coins).

Equipment

Here a general overview of the machines that are available in the group. More detailed information about current measurements at the science stations can be found at the Research page.

Different methods of sample modification and characterization are available with the spectrometer VG ESCALAB 220i-XL.

  • XPS (X-ray photoelectron spectroscopy)
  • UPS (Ultraviolet photoelectron spectroscopy)
  • LEED (Low energy electron spectroscopy)
  • AES (Auger electron spectroscopy)
  • SEM (Secondary electron microscopy)
  • PLD (Pulsed laser deposition)
  • EBE (Electron beam evaporation)

Actually, this equipment is employed within the framework of the described research projects and for external service measurements.

enlarge the image: ESCALAB 220i-XL. Photo: Denecke Group
ESCALAB 220i-XL. Photo: Denecke Group
enlarge the image: Bruker S4 Explorer. Photo: Denecke Group
Bruker S4 Explorer. Photo: Denecke Group

The Bruker S4 Explorer is a high-performance wavelength dispersive X-ray fluorescence spectrometer. An own power press for sample preparation with special wax as well as the usage of Mylar foil allow a wide range of applications from solids to liquids.

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