He同位素对He-NO碰撞体系微分截面的影响

用密耦近似方法计算了同位素He原子与NO分子碰撞体系的总微分截面、弹性微分截面和非弹性微分截面，总结了同位素He原子对He-NO碰撞体系微分截面的影响. 计算结果表明：在同一入射能量下，随着入射同位素He原子质量增加，总微分截面在0°时的角分布逐渐增大；同位素He原子与NO分子碰撞发生的彩虹现象越明显. 同时，体系约化质量增加的效应大于相对碰撞速度减小的效应，使散射振荡间隔逐渐减小. 关键词： He-NO 密耦近似 微分截面 同位素效应

Influence of He isotope on the differential cross section for He-NO collision system

The total differential cross section, elastic differential cross section and inelastic differential cross section for collision between He isotopic atoms and NO molecule have been calculated by using close-coupling approximation method. The influence of He isotope on the differential cross section for He-NO collision system has been given. The calculated result shows that the total differential cross section at 0 degree increases, and rainbow phenomenon of collision of He isotopic atoms with NO molecule is more evident along with increase of incident He isotope mass at identical incident energy. At the same time, the effect of increased reduced mass is larger than the effect of diminished relative velocity of collision between He atom and NO molecule, and enables the scattering spacing of the oscillation to gradually decrease.