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.

引用

页码：67402 / 1

页数：4

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