^(20)Ne(^(34)Ne)原子与^(18)Na_2(^(23)Na_2,^(37)Na_2)分子低温下冷碰撞的同位素效应研究

Study of isotope effect in ^(20)Ne(^(34)Ne)-^(18)Na_2(^(23)Na_2,^(37)Na_2) low-temperature collisions

本文用多体刚性椭球模型计算了相对入射能量为190meV时,氖的同位素原子20Ne,34Ne与钠的同位素分子18Na2,23Na2,37Na2替代碰撞体系的态态转动激发积分散射截面和总转动激发积分散射截面,在此基础上计算并分析了相互作用势的不同区域对20Ne-18Na2,23Na2,37Na2各碰撞体系转动激发积分散射截面的贡献情况.通过分析各碰撞体系转动激发积分散射截面的差异,总结出在钠分子的对称同位素替代情形下20Ne,34Ne-18Na2,23Na2,37Na2碰撞体系转动激发积分散射截面随转动量子数和体系约化质量变化的规律.

Multiple ellipsoid model is applied to the20 Ne,34 Ne-18 Na2,23 Na2 and37 Na2 collision systems.The integral cross-sections for rotational excitation and total collision cross-sections at the incident energy of 190 meV are calculated.Moreover,at the related incident energy,the contributions of different regions of the potential to the integral cross-sections of rotational excitation for20 Ne-18 Na2,23 Na2 and37 Na2 collision systems are investigated.By analyzing the differences of these integral cross-sections,the change rules of the integral cross sections with the change of rotational angular quantum number of Na2 molecule,as well as with the change of the reduced mass of symmetric isotopic substituted system are obtained.