Phys. Rev. Lett. 87, 067402 (2001) [4 pages]Lifetime Measurements with a Scanning Positron Microscope
See accompanying Physics Focus First lifetime results obtained with a scanning positron microscope will be presented. A pulsed positron beam with a variable energy from 0.5 to 20 keV, with a spot diameter of 2μm, can be electronically scanned over an area of 0.6×0.6mm2. 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. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.067402
DOI:
10.1103/PhysRevLett.87.067402
PACS:
78.70.Bj, 07.78.+s, 41.75.Fr, 61.72.Ji
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