Electron and positron collisions with polar molecules: studies with the benchmark water molecule

被引：62
作者：
Zhang, Rui [1 ]
Faure, Alexandre [2 ]
Tennyson, Jonathan [1 ]
机构：
[1] UCL, Dept Phys & Astron, London WC1E 6BT, England
[2] Univ Grenoble 1, CNRS, UMR 5571, Astrophys Lab, F-38041 Grenoble 09, France
来源：
PHYSICA SCRIPTA | 2009年 / 80卷 / 01期
基金：
英国工程与自然科学研究理事会;
关键词：
TOTAL CROSS-SECTIONS; ROTATIONALLY INELASTIC-SCATTERING; INTERMEDIATE ENERGIES; POLYATOMIC-MOLECULES; BACKWARD ANGLES; H2O MOLECULES; R-MATRIX; EXCITATION; IMPACT; APPROXIMATION;
D O I：
10.1088/0031-8949/80/01/015301
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
It is difficult to measure low-energy cross sections for collisions of charged particles with strongly dipolar systems since the magnitude of such cross sections is completely dominated by collisions in the forward direction. Theoretically, it is possible to account for the strong forward scattering using the Born approximation but the procedure for combining Born 'top-up' with the more sophisticated treatments required to treat the scattering in other directions is not unique. This comment describes recent progress in describing both electron and positron collisions with polar molecules taking the important water molecule as a benchmark. Previous calculations on electron water at collision energies below 7 eV are compared with new experiments. Positron water studies up to 10 eV are re-analysed based on given experimental acceptance profiles, which depend on the details of the apparatus and method used in the measurements. It is suggested that theory is capable of giving reliable results for elastic and rotationally inelastic electron/positron collisions with strongly dipolar species.
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页数：7
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