A MODIFIED ADIABATIC APPROACH TO POSITRON-ATOM AND POSITRON-MOLECULE POLARIZATION POTENTIALS - APPLICATION TO POSITRON-HE SCATTERING

被引：20
|
作者：
GIBSON, TL
机构：
[1] Department of Physics and Engineering Physics, Texas Tech University, Lubbock, TX, 79409
来源：
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 1990年 / 23卷 / 04期
关键词：
D O I：
10.1088/0953-4075/23/4/010
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A novel treatment of short-range correlation effects designed for use in calculating positron-atom and positron-molecule polarisation potentials is presented. The treatment is based on a physically motivated approximation that mimics the effect of the dominant non-adiabatic correction to the adiabatic potential at low scattering energies, namely virtual positronium formation. As an initial test of the method, positron-He scattering phaseshifts, scattering length and differential cross sections have been calculated and found to be in good agreement with accurate results. This method is immediately extendible to positron-molecule collisions and does not require significantly more work than a purely adiabatic treatment. © 1990 IOP Publishing Ltd.
引用
收藏
页码：767 / 776
页数：10
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