摘要:
应用参数化的最佳有效势方法,推广三体库仑波模型（3C）及动力学屏蔽的三体库仑波模型（DS3C模型）于Na原子,计算了共面双对称几何条件下,电子碰撞Na原子单电离的三重微分截面（TDCS）,与最近Murray的测量数据、Hitawala等人的扭曲波近似（DWBA）及考虑极化的扭曲波近似（DWBAP）的理论结果进行了比较.发现,DWBA在低入射能量反映了实验结果,而3C计算在低入射能量时失效,DS3C计算对其有所改善.入射能量较高时DS3C及3C结果的角度分布优于DWBA,能够较好地定性描述上述碰撞过程.说明对于共面双对称几何条件下的电子碰撞多电子原子单电离过程,出射道三粒子间的动力学关联效应是比较强的.
Abstract:
Dynamically screened three-Coulomb-wave model（DS3C） is used to study the single ionization of the 3S orbital of sodium by electron impact.Triply differential cross-sections（TDCSs） are calculated in doubly symmetric geometry at excess energies of 6,10, 15,20,30,40,50 and 60 eV using a parameterized optimized effective potential.Comparisons are made between recently experimental data and theoretical predictions of the three-Coulomb wave function（3C） approach and distorted-wave Born approximation（DWBA）. The angular distribution of the present TDCS is found to qualitatively reproduce the reported experimental data.It is shown that dynamically screened effects are important in this geometry.
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