PAES

Positron annihilation induced Auger electron spectrometer

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 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

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

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

Operated by

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

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