中低能入射电子与氦离子碰撞的(e,2e)反应三重微分截面

Triple Differential Cross Sections for Nearthreshold H+(e,2e) Reactions

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 electron and the screened ionic nucleus. Since the present work deals with symmetric collisions, the electron exchang effect between the two continuum electrons has been taken into account properly. It is shown that the initial channel Coulomb field plays a major role in single binary collision in determining the triple differential cross sections at nearthreshold incident energy.