^3He、^4He与H2、D2、T2碰撞(E=0．5eV)分波截面的理论研究  

A Theoretical Study on the Partial Wave Cross Section for the Collisions of ~3He and ~4He with H_2(D_2 and T_2)

作　　者：徐梅[1] 沈光先[1] 汪荣凯[1] 令狐荣锋[1] 

机构地区：[1]贵州师范大学理学院,贵州贵阳550001

出　　处：《四川师范大学学报（自然科学版）》2008年第5期576-579,共4页Journal of Sichuan Normal University（Natural Science）

基　　金：国家自然科学基金(10574096);贵州省教育厅自然科学重点基金(2005105);贵州省优秀科技教育人才省长专项基金(黔省专合字(2006)113号)资助项目

摘　　要：用密耦近似(Close-Coupling)方法和Tang-Toennies势模型计算了入射能量E=0.50 eV情况下,氦原子的两种同位素(3He、4He)与H2及其同位素D2、T2替代碰撞体系的振转激发碰撞截面.通过分析各碰撞体系分波截面的差异,总结出在对称同位素替代情形下3He、4He与H2、D2、T2碰撞体系分波截面随量子数增加和体系约化质量的变化规律.结果表明,体系的约化质量变化给体系的碰撞截面带来不同程度的影响.In this paper, Tang-Toennies potential and Close-coupling equation are applied to the collisions of 4 He and 3 He with H2 （ D2 and T2 ） systems when incident energy is 0.50 eV. The vibrational and rotational excitation cross sections are calculated. By analyzing the partial wave cross sections, the changing tendence of the partial wave cross sections with the quantum number and reduced mass in the symmetric isotopic substitution systems are obtained. The results show that the reduced mass change can influence the cross section of the system to certain extent.

关 键 词：密耦方法 散射截面 T-T势模型 同位素替代 

分 类 号：O561.1[理学—原子与分子物理]