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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页码：441 / 456

页数：16

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