末态电子的关联在氢原子(e,2e)反应中的影响(英文)

在共面非对称几何条件下,利用双势公式解析计算了电子碰撞电离氢原子的三重微分截面.对快电子采用平面波近似,跃迁矩阵元可以表示成两个因子乘积的形式,即结构散射因子和出射道两电子的关联因子.在计算过程中对关联因子采取了最简单的近似,当入射能量为150 eV和54.4 eV时,计算结果与实验结果的符合说明对于这些入射能量该关联近似是有效的;而对于入射能量为27.2 eV时,计算结果与实验结果的较大差异说明这种关联近似是无效的.

Influence of electron correlation in final continuum on hydrogen (e,2e) processes

Electron correlation in triple differential cross sections for ionization of atomic hydrogen by the electron impact is analyzed for the case of coplanar,asymmetric geometry within the framework of the two-potential formulae.Based on the approximation of faster-electron plane wave,the transition matrix element is analytically expressed to be a product of two factors: the structure-scattering factor and the correlation factor of two electrons in the final channel.The effect of the latter is most easily taken into account in numerical calculation.The close agreement between the results and the absolute measurements at incident energies of 150 eV and 54.4 eV implies that the approximation is valid for those incident energies.The large difference between the results and experiment at incident energy of 27.2 eV suggests that the approximation is not effective for this incident energy.