钠分子同位素替代对低温下的He-Na_2冷碰撞体系转动激发积分散射截面的影响  

Influence of isotope substitution of sodium molecule on the integral cross sections of rotational excitation in low-temperature collisions of He-Na_2

作　　者：臧华平[1] 李文峰[1] 令狐荣锋[1,2] 程新路[1] 杨向东[1] 

机构地区：[1]四川大学原子与分子物理研究所,成都610065 [2]贵州师范大学物理与电子科学学院,贵阳550001

出　　处：《物理学报》2011年第2期35-41,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10974139;10964002);贵州省科学技术基金(批准号:黔科合J字[2009]2066号);高等学校博士点专项科研基金(批准号:20050610010)资助的课题~~

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.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.

关 键 词：多体刚性椭球模型 转动激发积分散射截面 钠同位素分子 椭球等势面 

分 类 号：O562.6[理学—原子与分子物理]