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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