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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

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 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 secondary 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, conventional AES and XPS. Examples for PAES studies are surfaces covered 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

Prof. Dr. Christoph Hugenschmidt
Phone: +49 (0)89 289-14609
E-Mail: christoph.hugenschmidt@frm2.tum.de

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

TUM Research Group:
Physics with Positrons

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 Hereon> Helmholtz-Zentrum Hereon
Forschungszentrum Jülich> Forschungszentrum Jülich

MLZ is a member of:

LENS> LENSERF-AISBL> ERF-AISBL

MLZ on social media: