(e,2e)反应中冲量近似的理论研究

利用冲量近似理论和玻恩近似方法, 以氢原子(1s)为例, 在共面不对称几何条件下用多种模型分别计算了若干入射能、 散射角情形下电子碰撞电离(e, 2e) 反应的三重微分散射截面. 与其他的理论方法和实验数据进行了比较, 分析了曲线结构差异及原因, 对其适用范围进行了研究, 并探讨了交换效应的贡献, 验证了早期的研究. 关键词： 扭曲波冲量近似 平面波冲量近似 三重微分截面

A theoretical study on impulse approximation of (e, 2e) reactions*

The triple differential cross sections for electron impact ionization hydrogen (e, 2e) reactions are calculated as an example by use of the impulse approximation and Born approximation model at different coplanar asymmetric geometries. The results of the present work are compared with experimental data. The structures of the cross sections and the physical nature of these structures are discussed in detail. Moreover, the exchange effect contribution to the cross section is also discussed, which supports our earlier conclusions.
Keywords： distorted wave impulse approximation model plane wave impulse approximation model triple-differential cross section