ABSOLUTE TRIPLE-DIFFERENTIAL AND DOUBLE-DIFFERENTIAL CROSS-SECTIONS FOR IONIZATION OF HELIUM BY ELECTRON-IMPACT

被引:32
作者
VANWINGERDEN, B
KIMMAN, JT
VANTILBURG, M
WEIGOLD, E
JOACHAIN, CJ
PIRAUX, B
HEER, FJD
机构
[1] FOM Institute for Atomic and Molecular Physics, Amsterdam/Wgm
关键词
D O I
10.1088/0022-3700/12/20/008
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The authors have measured absolute (e,2e) cross sections for electron impact ionisation of helium with a much higher accuracy than obtained before. In a coplanar symmetric geometry ( theta =45 degrees ) both outgoing electrons-with equal velocities-were detected in coincidence. The resulting experimental triple differential cross sections for incoming electrons of 200-2800 eV contain an experimental error smaller than 20%. At the same time the authors have determined the absolute double differential cross sections at 45 degrees to an accuracy of 10%. The data are compared with various theoretical results.
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页码:L627 / L631
页数:5
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