%0 Journal Article
%T DIFFERENTIAL CROSS SECTIONS FOR ELECTRON IMPACT IONIZATION OF HELIUMLIKE IONS<br>类氦离子的电子碰撞电离微分截面
%A FANG DU-FEI
%A WANG YAM-SEN
%A HU WEI
%A <br>方渡飞
%A 王炎森
%A 胡畏
%J 物理学报
%D 1992
%I 
%X The electron impact ionization cross sections for different energy assignment on two final-state electrons (energy differential cross sections) of heliumlike ions have been calculated by using a disrored-wave Born exchange approximation. We found that the dependence of the differential cross sections on the scaled energy of secondary electrons can be well fitted with a two-parameter Gaussian function. The dependence cf two parameters on the incident electron energy and target charges have been given. The differences between the results from CBE (Coulomb-Born exchange approximation) and DBE calculations have been discussed. They show that it is necessary to use DBE calculation for low target charges and low incident en-
%K 氦
%K 离子
%K 电子碰撞
%K 微分截面
%K 电离
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=5600A65DFA34946CAD1EFF042C6B8799&yid=F53A2717BDB04D52&vid=2001E0D53B7B80EC&iid=94C357A881DFC066&sid=195767709E606C85&eid=762CFFBBDED11937&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=1