| 64.6 eV电子碰撞电离氦原子(e, 2e)反应的理论研究 |
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| 引用本文： | 陈展斌,刘丽娟,董晨钟. 64.6 eV电子碰撞电离氦原子(e, 2e)反应的理论研究[J]. 物理学报, 2012, 61(14): 143401-143401 |
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| 作者姓名： | 陈展斌 刘丽娟 董晨钟 |
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| 作者单位： | 西北师范大学物理与电子工程学院,甘肃省原子分子物理与功能材料重点实验室,兰州730070 |
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| 基金项目： | 国家自然科学基金(批准号: 10847007, 10876028, 10964010)、 高等学校博士学科点专项科研基金(批准号: 20070736001)、 兰州重离子加速器国家实验室原子核理论中心基金和西北师范大学科技创新工程 (批准号: NWNU-KJCXGC-03-21)资助的课题. |
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| 摘 要： | 利用BBK理论及其修正模型,计算了入射能64.6 eV、 不同枪角情况下,电子碰撞电离氦原子(e, 2e)反应的三重微分散射截面. 分析了曲线结构,对其内部碰撞机制进行了详细的研究和探讨.结果表明: 在非共面几何条件下,碰撞微分截面上所呈现出来的特征是由多种效应共同作用所决定的, 随着条件的不同而相互转化.且在垂直入射几何条件下,末通道存在着极强的动力学屏蔽.
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| 关 键 词： | BBK模型 三重微分截面 非共面几何条件 |
| 收稿时间： | 2011-06-08 |
A theoretical study on electron impact ionization helium (e, 2e) reactions at 64.6 eV |
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| Chen Zhan-Bin,Liu Li-Juan,Dong Chen-Zhong. A theoretical study on electron impact ionization helium (e, 2e) reactions at 64.6 eV[J]. Acta Physica Sinica, 2012, 61(14): 143401-143401 |
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| Authors: | Chen Zhan-Bin Liu Li-Juan Dong Chen-Zhong |
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| Affiliation: | Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China |
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| Abstract: | The triple differential cross sections for electron impact ionization helium (e, 2e) reactions are calculated by use of the BBK and modified BBK model at different gun angles of incident electron energy 64.6 eV. The structures of the cross sections and the physical natures of these structures are discussed in detail. It is found that for the non-coplanar geometry, cross sections are determined by a variety of effects together and these effects are converted to each other under different conditions. Moreover, strong dynamical screening effect is observed in the final state of the perpendicular plane symmetric geometry. |
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| Keywords: | BBK model triple-differential cross section non-coplanar geometry |
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