Novel time-of-flight spectrometer for the analysis of positron annihilation induced Auger electrons
- Technische Universitaet Muenchen, ZWEFRM-II, Lichtenbergstrasse 1, 85747 Garching (Germany) and Physik-Department E21, Technische Universitaet Muenchen, James-Franck-Strasse, 85748 Garching (Germany)
Positron annihilation induced Auger-electron spectroscopy (PAES) has several advantages over conventional Auger-electron spectroscopy such as extremely high surface sensitivity and outstanding signal-to-noise ratio at the Auger-transition energy. In order to benefit from these prominent features a low-energy positron beam of high intensity is required for surface sensitive PAES studies. In addition, an electron energy analyzer is required, which efficiently detects the Auger electrons with acceptable energy resolution. For this reason a novel time-of-flight (TOF) spectrometer has been developed at the intense positron source NEPOMUC that allows PAES studies within short measurement time. This TOF-PAES setup combines a trochoidal filter and a flight tube in a Faraday cage in order to achieve an improved energy resolution of about 1 eV at high electron energies up to E{approx_equal}1000 eV. The electron flight time is the time between the annihilation radiation at the sample and when the electron hits a microchannel plate detector at the end of the flight tube.
- OSTI ID:
- 20861173
- Journal Information:
- Review of Scientific Instruments, Vol. 77, Issue 10; Other Information: DOI: 10.1063/1.2356861; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANNIHILATION
AUGER ELECTRON SPECTROSCOPY
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
ENERGY RESOLUTION
FARADAY CUPS
FILTERS
POSITRON BEAMS
POSITRON SOURCES
POSITRONS
SIGNAL-TO-NOISE RATIO
SURFACES
TIME-OF-FLIGHT METHOD
TIME-OF-FLIGHT SPECTROMETERS
TUBES