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

Abstract

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.

Authors:
;  [1]
  1. Technische Universitaet Muenchen, ZWEFRM-II, Lichtenbergstrasse 1, 85747 Garching (Germany) and Physik-Department E21, Technische Universitaet Muenchen, James-Franck-Strasse, 85748 Garching (Germany)
Publication Date:
OSTI Identifier:
20861173
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 77; Journal Issue: 10; Other Information: DOI: 10.1063/1.2356861; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Hugenschmidt, Christoph, Legl, Stefan, and Physik-Department E21, Technische Universitaet Muenchen, James-Franck-Strasse, 85748 Garching. Novel time-of-flight spectrometer for the analysis of positron annihilation induced Auger electrons. United States: N. p., 2006. Web. doi:10.1063/1.2356861.
Hugenschmidt, Christoph, Legl, Stefan, & Physik-Department E21, Technische Universitaet Muenchen, James-Franck-Strasse, 85748 Garching. Novel time-of-flight spectrometer for the analysis of positron annihilation induced Auger electrons. United States. https://doi.org/10.1063/1.2356861
Hugenschmidt, Christoph, Legl, Stefan, and Physik-Department E21, Technische Universitaet Muenchen, James-Franck-Strasse, 85748 Garching. 2006. "Novel time-of-flight spectrometer for the analysis of positron annihilation induced Auger electrons". United States. https://doi.org/10.1063/1.2356861.
@article{osti_20861173,
title = {Novel time-of-flight spectrometer for the analysis of positron annihilation induced Auger electrons},
author = {Hugenschmidt, Christoph and Legl, Stefan and Physik-Department E21, Technische Universitaet Muenchen, James-Franck-Strasse, 85748 Garching},
abstractNote = {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.},
doi = {10.1063/1.2356861},
url = {https://www.osti.gov/biblio/20861173}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 77,
place = {United States},
year = {Sun Oct 15 00:00:00 EDT 2006},
month = {Sun Oct 15 00:00:00 EDT 2006}
}