Open AccessDIFFERENTIAL CROSS SECTIONS FOR ELECTRON IMPACT IONIZATION OF HELIUMLIKE IONS
Author(s) -
Dufei Fang,
Wang Yam-Sen,
Wei Hu
Publication year - 1992
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.41.744
Subject(s) - atomic physics , ionization , ion , electron , physics , born approximation , electron ionization , wave function , gaussian , coulomb , energy (signal processing) , quantum mechanics
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-