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Author David, A. ♦ Koegel, G. ♦ Sperr, P. ♦ Triftshaeuser, W.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ♦ ELECTRONS ♦ LIFETIME ♦ MICROSCOPES ♦ POSITRON BEAMS ♦ POSITRONS ♦ SPECTRA ♦ STOCHASTIC COOLING
Abstract First lifetime results obtained with a scanning positron microscope will be presented. A pulsed positron beam with a variable energy from 0.5 to 20keV, with a spot diameter of 2 {mu}m , can be electronically scanned over an area of 0.6 x 0.6 mm{sup 2} . This beam is formed after a double-stage stochastic cooling (moderation) of positrons emitted from a radioactive isotope. Included in the system is a conventional scanning electron microprobe for surface analysis. Three-dimensional positron lifetime spectra of a GaAs sample with a small surface scratch reveal the range due to the mechanical damage.
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-08-06
Publisher Place United States
Journal Physical Review Letters
Volume Number 87
Issue Number 6


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