中文摘要：

用多体刚性椭球模型计算了不同能量下氦的同位素原子4He,10He与钠的同位素分子18Na2,23Na2,37Na2替代碰撞体系的转动激发积分散射截面.通过分析4He,10He-18Na2,23Na2,37Na2各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4He,10He-18Na2,23Na2,37Na2碰撞体系转动激发积分散射截面随钠分子转动量子数和体系约化质量变化的规律.结果表明,体系的约化质量及入射原子相对碰撞能量的变化均给体系的碰撞截面带来不同程度的影响.另外,计算了相对入射能量为100meV时,相互作用势的不同区域对10He-18Na2,23Na2,37Na2各碰撞体系转动激发积分散射截面的贡献情况.

英文摘要：

Multiple ellipsoid model is applied to the 4He,10 He-18 Na2,23 Na2,and 37 Na2 collision systems,and integral cross-sections for rotational excitation and the total collision cross-sections at the incident energy of 50,100 and 200 meV are calculated. By analyzing the differences of these integral cross-sections,the change rules of the integral cross sections with the increase 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. Based on the calculation,influence on the cross-sections exerted by the variations in the reduced mass of systems and in the relative incoming energy of incident atom is discussed. Moreover, at the relative incident energy of 100 meV,the contributions of different regions of the potential to integral cross-sections of rotational excitation for10He-18Na2,23Na2 and 37Na2 collision systems are investigated.