电子碰撞电离氦原子的三重微分截面  

TDCS of elctron-impact ionization of helium

作　　者：肖全志[1] 贾昌春[1] 章韦芳[1,2] 陈姣姣[1] 

机构地区：[1]安徽大学物理与材料科学学院,安徽合肥230039 [2]合肥师范学院物理与电子工程系,安徽合肥230061

出　　处：《安徽大学学报（自然科学版）》2011年第6期41-47,共7页Journal of Anhui University(Natural Science Edition)

基　　金：2006年安徽大学人才引进基金资助项目

摘　　要：在一级玻恩近似理论框架下,用分波法计算入射电子能量分别为634.59、604.59、400、250、150 eV的氦原子(e,2e)反应的三重微分截面(TDCS),并与实验结果进行比较.在入射电子能量为604.59、400、250 eV情况下,全扭曲波玻恩近似与实验较为符合;在入射电子能量为634.59 eV情况,其敲出电子能量40 eV条件下,考虑敲出电子库仑势的计算结果好于考虑敲出电子扭曲势的计算结果.在固定散射角情况下,Recoil峰的相对强度和Binary峰值位置随敲出电子能量变化的趋势,与文献(Ehrhatdt H,Hesselbacher K H,Jung K,et al.Collisional ionization of helium by 250 eV electrons:experiments with completely determined kinetics[J].J Phys B:At Opt Mol Phys,1972,5:2107-2116)中提到的变化趋势一致.The triple differential cross sections（TDCS） for electron-impact ionization of helium（e,2e） reaction,using the method of partial wave expansions within the framework of first-order born approximation,were calculated at incident energies of 634.59,604.59,400,250 and 150 eV respectively.The results were compared with experimental measurements.It was obtained that the theoretical results using the full distorted wave born approximation had a better agreement with the experimental results at incident energies of 604.59,400 and 250 ev.For the case of incident energy of 634.59 ev,better agreement with the experimental result was achieved if the 40 ev ejected electron was described by a Coulomb wave instead of the distorted wave.The trend,observed by the paper（Ehrhatdt H,Hesselbacher K H,Jung K,et al.Collisional ionization of helium by 250 ev electrons： experiments with completely determined kinetics[J].J Phys B： At Opt Mol Phys,1972,5：2107-2116）,for changes of the relative intensity of the recoil peak and the angular position of the binary peak with ejected electron energy at a fixed scattering angle,has been confirmed.

关 键 词：三重微分截面 扭曲波 平面波 库仑波 RECOIL峰 BINARY峰 

分 类 号：O561.5[理学—原子与分子物理]