Positron- and electron-impact double ionisation of helium at low and intermediate energies

被引：32
作者：
Berakdar, J
机构：
[1] Atom. and Molec. Phys. Laboratories, Res. Sch. of Phys. Sci. and Eng., Australian National University, Canberra
来源：
PHYSICS LETTERS A | 1996年 / 220卷 / 4-5期
关键词：
D O I：
10.1016/0375-9601(96)00537-3
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Using a correlated four-body final-state wavefunction the angular distribution of fragments following double ionisation of helium by positron and electron impact is studied. Distortion of angular patterns due to projectile-electron and projectile-nucleus interactions is investigated. Further, the influence of two-body Coulomb-density of states in the four-body continuum is envisaged. It is shown that these interactions, previously neglected in Born-type treatments, play a major role in determining the cross section at low and intermediate energies.
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页码：237 / 241
页数：5
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