He同位素原子与HBr分子碰撞的微分截面

基于作者构造的He-HBr体系的各向异性势，采用密耦方法计算了³He，⁴He，⁶He和⁷He与HBr分子在碰撞能量分别为40和75meV时的微分截面，详细讨论了入射氦同位素对微分截面的影响.结果表明：在相同碰撞能量时，随着同位素氦原子质量的增加，总微分截面在0° 时的角分布逐渐增大，同一级衍射振荡极小值位置逐渐向小散射角方向移动；弹性与总非弹性截面交界角逐渐减小，总非弹性截面逐渐增加.碰撞能量越低，入射同位素He原子的 关键词： 同位素效应 微分截面 各向异性势 He-HBr体系

Differential cross sections for collisions between He isotope atoms and HBr molecules

Differential cross sections (DCSs) for collisions in ³He-HBr, ⁴He-HBr, ⁶He-HBr and ⁷He-HBr are calculated by the close-coupling approach from the anisotropic intermolecular potential of the He-HBr system established by the author. The calculations are performed separately at the collision energies of 40 and 75 meV. The influence of the incident isotope He atoms on DCSs is discussed in detail. The results show that the angular distribution of the total DCSs at zero degree increases and the position of oscillation minimum of the same order gradually shifts towards small scattering angle along with the increase of the incident isotope He atom mass at identical collision energy. And crossing angle between the elastic and total inelastic DCSs gradually decreases and the total inelastic DCS gradually increases. The rainbow phenomenon becomes more evident the lower the collision energy and the larger mass of the incident He isotope atom.