共面双对称条件下电子碰撞Ar原子单电离的一阶扭曲波Born近似  

First-order distorted wave Born approximation for single ionization of Ar by electron impact in a coplanar doubly symmetric geometry

作　　者：张立民[1] 贾昌春[1] 王琦[1] 陈长进[2] 

机构地区：[1]安徽大学物理与材料科学学院,合肥230601 [2]汕头大学理学院物理系,汕头515063

出　　处：《物理学报》2014年第15期85-90,共6页Acta Physica Sinica

基　　金：安徽大学博士科研启动经费(批准号:02303319:33190203);国家自然科学基金(批准号:11274219)资助的课题~~

摘　　要：在共面双对称几何条件下,利用一阶扭曲波Born近似计算了中低能电子碰撞Ar原子(3p壳层电子)单电离的三重微分截面,并与最近的实验数据做了比较.结果表明,对于Ar原子,当入射电子能量比电离阈高40 eV以上,随着入射能量的增加,binary和recoil碰撞机理逐渐占据支配地位;在近阈能量范围,上述碰撞机理不再处于支配地位,扭曲效应明显.要完备地描述中低能入射条件下Ar原子的电子碰撞电离过程,理论模型必须同时考虑多种散射机理.The first-order distorted wave Born approximation （DWBA） has been performed for single ionization of Ar（3p） by electron impact in coplanar doubly symmetric geometry from near threshold to intermediate energies. Theoretical triple differential cross sections （TDCS） are compared with the latest experimental data. It is found that when the incident electron energies are 40 eV higher than the ionization threshold, for argon, the binary and recoil collision mechanism will dominat as the energies increase, but not in the near threshold energy regime, where the distortion effects are of great significance. In order to completely describe the electron impact ionization of argon, it is imperative that more scattering mechanisms should be considered in the theoretical models.

关 键 词：电子碰撞电离 共面双对称 一阶扭曲波Born近似 AR原子 

分 类 号：O562[理学—原子与分子物理]