H原子(e,2e)反应中电子角分布的理论研究

使用3C和DS3C模型,计算了不同入射能情形下电子入射离化H原子的三重微分截面,并对截面的结构进行了分析.结果表明:角分布基本上由两个峰组成,即binary峰和recoil峰.两个峰的形状和位置对两个出射电子的能量分配及探测的几何条件十分敏感.更进一步,末态电子与电子的排斥对形成观测到的角分布有显著的贡献,在不同几何条件下,三体相互作用通过不同散射幅的不同权重控制了干涉花样.此外,对直接和交换效应也都进行了研究. 关键词： 角分布 binary峰 recoil峰

A THEORETICAL STUDY ON ELECTRON ANGULAR DISTRIBUTIONS FOR (e,2e) PROCESSES ON HYDROGEN

In this work the triple differential cross sections for electron impact ionization of atomic hydrogen at different energies are calculated by use of 3C and DS3C models. The structure of the cross sections is analysed. It is seen that the angular distribution basically consists of two peaks which can be assigned to the binary and recoil peaks. The shape and position of the two peaks depend sensitively on the detection geometry and the energy shared between the two electrons. Furthermore, the final-state electron-electron repulsion contributes significantly to the form of the observed angular distributions. For different collision geometry, the three-body interactions will control the interference pattern of various scattering amplitudes by different weighting between these amplitudes. In addition, the direct and exchange amplitudes are also considered.