^3He(^4He)与H2分子碰撞的同位素效应研究  

Study of isotope effect in ~3He(~4He)-H_2 collisions

作　　者：沈光先[1] 汪荣凯[1] 令狐荣锋[1] 杨向东[2] 

机构地区：[1]贵州师范大学理学院,贵阳550001 [2]四川大学原子与分子物理研究所,成都610065

出　　处：《物理学报》2008年第6期3452-3457,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10574096);高等学校博士点专项科研基金(批准号:20050610010);贵州省教育厅自然科学重点项目(批准号:2005105);贵州省优秀科技人才省长专项资金项目(批准号:黔省专合字(2006)113号)资助的课题~~

摘　　要：用公认精确度较高的密耦近似方法计算了入射能量E=0·5eV时惰性气体原子3He(4He)与H2分子替代碰撞体系的转动激发碰撞截面.通过分析3He(4He)-H2碰撞体系分波截面和微分截面的差异,总结出在氦原子的同位素替代情形下3He(4He)-H2碰撞体系分波截面和微分截面随分波数增加和同位素原子质量改变的变化规律.Close-coupling equation is applied to the 3He（4He）-H2 system,and the rotational excitation cross sections for incidence energy of 0.5eV are calculated.By analyzing the differences between these partial wave cross sections and differential cross sections,the change of the partial wave cross sections and differential cross sections with increase of quantum number,as well as with the change of the mass of isotope atom are found out. Based on the calculation,the effect of isotopic substitution on atom-diatom collision is discussed.

关 键 词：散射截面 密耦方法 同位素替代 散射角 

分 类 号：O561[理学—原子与分子物理]