Polarisation effects in low-energy positron-molecule scattering

被引：12

作者：

Franz, J. ^{[1
]}

Baluja, K. L. ^{[2
]}

Zhang, R. ^{[1
]}

Tennyson, J. ^{[1
]}

机构：

[1] UCL, Dept Phys & Astron, London WC1E 6BT, England

[2] Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2008年 / 266卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

positron-molecule scattering; R-matrix method; differential cross section; carbon dioxide;

D O I：

10.1016/j.nimb.2007.12.055

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The UK molecular R-matrix method has been adapted to treat positron collisions from polyatomic targets. A simple empirical enhancement factor which corrects for the underestimation of electron-positron polarisation and correlation effects in the calculations performed with the static-plus-polarization model at low scattering energies is presented. Application of this model to positron scattering from carbon dioxide at energies below 8 eV is discussed. Introduction of the enhancement factor improves the integral cross sections significantly and introduces structures in the differential cross sections consistent with other studies. The prospects for a fully ab initio treatment of this problem are discussed. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：419 / 424

页数：6

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