Novel time-of-flight spectrometer for the analysis of positron annihilation induced Auger electrons

Journal Article · Sun Oct 15 04:00:00 EDT 2006 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2356861· OSTI ID:20861173

Hugenschmidt, Christoph; Legl, Stefan ^[1]

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1. 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, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 77; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
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