Fully differential cross sections for C6+ single ionization of helium

The three-Coulomb-wave(3C) model is applied to study the single ionization of helium by 2 MeV/amu C6+ impact.Fully differential cross sections(FDCS) are calculated in the scattering plane and the results are compared with experimental data and other theoretical predictions.It is shown that the 3C results of the recoil peak are in very good agreement with experimental observations,and variation of the position of the binary peak with increasing momentum transfer also conforms better to the experimental results.Furthermore,the contributions of different scattering amplitudes are discussed.It turns out that the cross sections are strongly influenced by the interference of these amplitudes.     

共面双对称几何中Li+(1s2)(e,2e)反应的理论研究

利用Berakdar理论,考虑了入射道的库仑相互作用,在共面双对称碰撞几何中,计算了能量为251eV入射电子碰撞Li⁺(1s²)(e,2e)反应的三重微分截面(TDCS),讨论了不同散射振幅对截面的贡献,分析了干涉效应及入射道库仑场对截面的影响.结果表明,它们对决定TDCS的角度分布和大小起着重要作用. 关键词：     

Effect of initial-state target polarization on the single ionization of helium by l-keV electron impact

We report new results of triple differential cross sections for the single ionization of helium by 1-KeV electron impact at the ejection energy of 10 eV. Investigations have been made for both the perpendicular plane and the plane perpendicular to the momentum transfer geometries. The present calculation is based on the threewCoulomb wave function. Here we have also incorporated the effect of target polarization in the initial state. A comparison is made between the present calculation with the results of other theoretical methods and a recent experiment [Diirr M, Dimopoulou C, Najjari B, Dorn A, Bartschat K, Bray I, Fursa D V, Chen Z, Madison D H and Ullrich J 2008 Phys. Rev. A 77 032717]. At an impact energy of 1 KeV, the target polarization is found to induce a substantial change of the cross section for the ionization process. We observe that the effect of target polarization plays a dominant role in deciding the shape of triple differential cross sections.     

电子碰撞He(1s2)原子电离的初态依赖与角度关联的无关性

利用DS3C模型,考虑了入射道靶原子He基态几种不同关联形式的波函数 ,分别计算了He(1s2)(e,2e)反应的三重微分截面.结果表明,微分截面的角度分布与靶基态任何形式的关联无关,而主要取决于出射道粒子间的干涉、关联、交换和多体耦合的共同作用.     

中低能入射电子与氦离子碰撞的(e,2e)反应三重微分截面

利用Ｂｅｒａｋｄａｒ和Ｂｒｉｇｇｓ对ＢＢＫ波函数Ｓｏｍｍｅｒｆｅｌｄ参数的修正结果（即考虑第三个粒子存在对两个粒子间相互作用的影响），并考虑了入射道的库仑相互作用及出射电子的交换对称性，计算了在共面－等能分享－固定相对角度几何情况下，入射能量分别为:５８．４、６８、８１．６、１０８．８和１７４．４ｅＶ的Ｈｅ＋（ｅ，２ｅ）反应三重微分截面．结果表明，在较低碰撞能量散射中，入射道库仑场对两体碰撞起主要作用． A corrrelated three body continuum wavefunction proposed by Brauner et al has been recently modified further to allow for three body effects by introducing Somerfeld parameters (Berakdar and Briggs). The triple differential cross sections for electron impact ionization of He+ in coplanar equal energy sharing and fixed relative angle geometry are calculated. The initial channel wavefunction involves a Coulomb wavefunction due to the long range Coulomb attraction between the incident...     

任意次幂径向坐标算符矩阵元计算公式

本文通过合流超几何函数的泰勒展开及微积分性质，导出了一个用级数形式表示的任意次幂径向坐标算符矩阵元与平均植计算的一般公式。     

电子碰撞He电离激发过程(e+He(1s2)→2e+He+(n=2))的理论研究 (cited: 1)

考虑He靶原子具有径向及角度关联的初态波函数,应用三体库仑模型(简称3C)研究电子碰撞He原子电离激发过程,并进行理论推导,按照实验要求计算和分析了在共面不对称几何条件下,能量分别为5.50、1.50和0.570 keV的入射电子碰撞He原子电离激发的三重微分截面(TDCS),并将其计算结果与绝对实验数据及其它理论结果进行了比较. 计算结果表明,BBK模型能够定性地描述这样的反应过程,且能反映实验数据中TDCS呈现出一强的recoil峰,对于某些能量和散射角,其recoil峰甚至高于binary峰,这与中高能单电离过程是完全不相同的.     

电子碰撞Li~+(ls)电离的三重微分截面

利用修正的ＢＢＫ理论,考虑入射道的库仑相互作用及出射道电子的交换对称性,在共面－等能分享－垂直角度碰撞几何中,计算了能量分别为８５．６、１０５．６、２２７．６和３７５．６ｅＶ的入射电子碰撞Ｌｉ＋（ｌｓ）电离的三重微分截面．讨论了干涉效应、关联效应及入射道库仑场对截面的影响.Based on revised BBK theory, triple differential cross sections (TDCS) have been calculated for ionization of Li + (ls) by electron impact. A coplaner, equal energy, fixed re1ative angle kinematics are chosen and the particular case where the scattered and ionized electrons emerge perpendicular to each other is emphasized. The incoming electron state is considered by a Coulomb wave from the long range...     

共面双对称几何中Li^＋（1s^2）（e,2e）反应的理论研究

利用Ｂｅｒａｋｄａｒ理论,考虑了入射道的库仑相互作用,在共面双对称碰撞几何中,计算了能量为２５１ｅＶ入射电子碰撞Ｌｉ＋（１ｓ２）（ｅ,２ｅ）反应的三重微分截面（ＴＤＣＳ）,讨论了不同散射振幅对截面的贡献,分析了干涉效应及入射道库仑场对截面的影响．结果表明,它们对决定ＴＤＣＳ的角度分布和大小起着重要作用．