^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

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.