相对流量技术及其在电子碰撞微分散射截面测量中的应用  

Relative flow technique and its application in the measurement of differential cross section by electron impact method

作　　者：陆根萌 刘亚伟[1] 徐龙泉[1] 张鑫[1] 康旭[1] 朱林繁[1] 

机构地区：[1]合肥微尺度物质科学国家实验室中国科学技术大学近代物理系,合肥230026

出　　处：《原子与分子物理学报》2016年第3期470-475,共6页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(U1332204和11274291);中央高校基本科研业务费专项基金(WK2030040067)

摘　　要：为了提高原子分子动力学参数的测量精度,本文把气体相对流量技术应用到快电子碰撞研究中.并且在此基础上测量了氙原子6s激发的广义振子强度,所得结果在小动量转移区间与前人的结果符合很好,表明气体相对流量技术在电子碰撞方法中的适用性.大动量转移区间6s的表观广义振子强度对电子碰撞能量的依赖行为,说明500 eV的电子碰撞能量还不满足一阶玻恩近似条件.与Hartree-Fock方法相比,考虑电子关联效应更全面的随机相移近似计算结果与本文的实验结果符合更好,说明对于像Xe这样的重原子,电子关联效应十分重要.To improve the accuracy of the dynamic parameters of atoms and molecules, in this work the relative flow technique is applied to the fast electron impact method. Then the generalized oscillator strength （GOS） of 6s excitation of xenon was measured based on this technique. The present result is in good agreement with the previous ones in the small momentum transfer region, which indicates the validity of the relative flow technique. The momentum transfer dependence behavior of the apparent generalized oscillator strength of the 6s excitation on the electron impact energies in the large momentum transfer region shows that the first Born approximation is not reached at an impact energy of 500 eV. Compared with the calculation based on the Hartree -Fock approximation, the result calculated by the random phase approximation with exchange in which the electron correlation effect is taken into account more comprehensively is in better agreement with the experimental value in this work, which means that the electron correlation effect is important for the heavy atoms like Xe.

关 键 词：气体相对流量技术 电子碰撞 广义振子强度 

分 类 号：O562.5[理学—原子与分子物理]