Lifetime measurements with a scanning positron microscope -: art. no. 067402

被引：77
作者：
David, A [1 ]
Kögel, G [1 ]
Sperr, P [1 ]
Triftshäuser, W [1 ]
机构：
[1] Univ Bundeswehr Munchen, Inst Nukl Festkorperphys, D-85577 Neubiberg, Germany
来源：
PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 06期
关键词：
D O I：
10.1103/PhysRevLett.87.067402
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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 2 mum, can be electronically scanned over an area of 0.6 x 0.6 mm(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 or a GaAs sample with a small surface scratch reveal the range due to the mechanical damage.
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页码：67402 / 1
页数：4
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