惰性气体被H_2分子散射的角分布研究

Study for the Angular Distributions of Scattering of H_2 by Inert Gas

用T .T(K .T .TangJ.Peter.Toennies)势模型和公认精密度较高的密耦 (Close Coupling)近似方法计算了E =0 .0 5eV时 ,在 0 0 0 0弹性碰撞和 0 0 0 2非弹性碰撞时 ,得到了氢分子转动激发角分布 ,并研究了原子与分子弹性碰撞和非弹性激发角分布随角度增加的变化规律。随散射角的增大 ,弹性碰撞角分布变小。且在角度为零点出现了散射极大 ,入射原子的约化质量增大 ,振荡幅度减小 ,当散射角大于 6 0°后 ,其变化规律趋于某一值附近。对于 0 0 0 2的非弹性碰撞入射原子约化质量增大 ,大角散射几率增大。

Tang Toennies potential and close coupling equation are applied to the H2-He(Ne Ar Kr Xe)system.Angular distributions of 00 00and 00 02 excitation have been calculated and studied on the changing pattern of the scattering for elastic and inelastic atom molecule collision with the increase of angle.The elastic differential cross section has maximum at θ=0°. With the increase of scattering angle, the value of elastic angular distributions will decrease. And with the increase of reduce mass of incident atom, the extent of oscillation will decrease too. When scattering angle is greater than 60°, the value of oscillation tends to a constant. For 00 02 inelastic collision, scattering at the large angle keep pace with the increase of reduce mass of incident atom.