SIMULTANEOUS EXCITATION AND IONIZATION OF HELIUM BY FAST PROJECTILES

被引：49
|
作者：
PEDERSEN, JOP
FOLKMANN, F
机构：
[1] Institute of Physics, University of Aarhus, 6759
来源：
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 1990年 / 23卷 / 03期
关键词：
D O I：
10.1088/0953-4075/23/3/014
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The cross sections for simultaneous excitation and ionisation in helium following impact of fast electrons, protons and Cq+(q=3-6) ions have been investigated by measuring the vacuum-ultraviolet radiation from transitions in HE II (np-1s) in the wavelength region 220-315 AA. The cross sections obtained with 500-2000 eV electrons are found to be larger by a factor of 1.4-2.3 than those obtained with protons of the same velocity (0.92-3.76 MeV). The difference is discussed in terms of an interference between two excitation-ionisation mechanisms. © 1990 IOP Publishing Ltd.
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收藏
页码：441 / 456
页数：16
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