He同位素与HBr碰撞对分波截面的影响

Influences of collisions between He isotope and HBr on partial cross sections

基于构造的各向异性势,用密耦方法求解散射方程,计算了E=40 meV时3He,4He,5He,6He和7He分别与HBr分子碰撞的弹性和非弹性分波截面,详细讨论了氦同位素原子对分波截面的影响.结果表明:对给定的碰撞能量和确定的碰撞体系,激发分波截面比弹性分波截面收敛快;激发态越高,截面收敛越快;尾部效应仅在弹性散射和低激发态中产生,高激发态不产生尾部效应.随着氦同位素原子质量的增大,弹性分波截面和态-态激发分波截面收敛速度变慢,收敛需要的分波数增多.

The established anisotropic potential was applied to the HBr-^3 He （^4He,^5He,^6He,^7He） system, using close coupling equation, and the elastic and inelastic partial cross sections （PCSs） were calculated. The calculations were performed at the incident energy of 40 meV. The influences of the isotope helium atoms on PCSs were discussed in detail. The results show that the excitation PCSs converge is faster than the elastic PCSs for the collision energy and systems considered here. The excitation PCSs converge is faster for the higher excited states. The tail effect is present only in elastic scattering and lower excited states but not in higher excited states. With the increase of the mass of the isotope helium atom, the converging speed of the elastic and state-to-state excitation PCSs slows down, and the convergent partial wave number increases.