氦同位素原子与钠分子碰撞转动激发积分散射截面的理论计算

Theoretical calculation of integral cross sections of rotational excitation for collisions in isotopes of He atom with Na_2 molecule

多体刚性椭球模型是一种比较精确的描述氦原子与钠分子碰撞的理论模型.本文用多体刚性椭球模型计算了不同能量下He的同位素原子3He,4He,7He,10He与Na2分子碰撞的转动激发积分散射截面,表明增加椭球等势面个数可以得到更准确的转动激发积分散射截面;总结出3He,4He,7He,10He-Na2碰撞体系转动激发积分散射截面随相对入射能量和体系约化质量变化的规律;讨论了相对入射能量为100meV时,相互作用势的不同区域对4He-Na2碰撞体系转动激发积分散射截面的影响情况.

Multiple hard-ellipsoid model is a theoretical model which can more accurately decribe collisions between He atom and Na2 molecule.In this paper,we adopted the multiple hard-ellipsoid model to calculate the integral cross sections of rotational excitation for collisions in 3He,4He,7He,10 He-Na2 systems at different relative incidence energies.This study shows that we can improve the accuracy of the results by increasing the number of equipotential ellipsoid surfaces.Moreover,we find that the integral cross sections of rotational excitation change with the relative incidence energy and reduced mass of the system.Finally,at relative incidence energy of 100 meV,we investigate the influence of different regions of the intermolecular potential on integral cross sections of rotational excitation in 4He-Na2 collisions.