MLZ is a cooperation between:

Technische Universität München> Technische Universität MünchenHelmholtz-Zentrum Geesthacht> Helmholtz-Zentrum GeesthachtForschungszentrum Jülich> Forschungszentrum Jülich
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Lichtenbergstr.1
85748 Garching

PAES

Positron annihilation induced Auger electron spectrometer

Sample chamber Sample chamber Sketch of the Auger sample chamber with sample preparation chamber and lock

Positron annihilation induced Auger electron spectroscopy (PAES) is a newly developed
application for surface studies with high elemental selectivity and exceptional surface sensitivity. The instrument is operated by the Technische Universität München and is located at NEPOMUC.

In PAES, the emission of Auger electrons is initiated by positron-electron annihilation that leads to several major advantages compared with conventional electron induced AES. The main features are:

  • topmost layer sensitivity
  • no secpndary electron background at the Auger peaks
  • non-destructive technique

PAES is part of the surface spectrometer (SuSpect) which also enables sample preparation in UHV conditions, conventaional AES and XPS. Examples for PAES studies are surfaces with sub-monolayers of foreign atoms, high resolution determination of Auger line shapes, element selective surface studies.

Technical Data

Beam properties

  • Positron implantation energy: 20 eV
  • Electron energy resolution: ΔE/E < 1%

Sample

  • Sample size: ø 10 mm
  • Sample thickness: 0.5 mm (0.1 – max. 3 mm)

Typical measurement times

  • Measurement time (typical for one PAES spectrum): 10 – 15 min

Complementary techniques

  • Electron or X-ray induced AES
  • XPS
  • STM

Instrument Scientist

Dr. Christoph Hugenschmidt
Phone: +49 (0)89 289-14609
E-Mail:

PAES
Phone: +49 (0)89 289-14774

Operated by

TUM

Citation of the instrument

Heinz Maier-Leibnitz Zentrum. (2015). PAES: Positron annihilation induced Auger electron spectrometer. Journal of large-scale research facilities, 1, A24. http://dx.doi.org/10.17815/jlsrf-1-51

For citation please always include the DOI.

Gallery

PAES
PAES
© W. Schürmann, TUM
PAES
PAES

The Auger-spectrometer with STM, sample preparation chamber and lock.

MLZ is a cooperation between:

Technische Universität München> Technische Universität MünchenHelmholtz-Zentrum Geesthacht> Helmholtz-Zentrum GeesthachtForschungszentrum Jülich> Forschungszentrum Jülich