He-HCl势能模型对散射截面影响的比较研究  

Comparison of the Effect of Interaction Potential Models on Scattering Cross Sections for He-HCl System

作　　者：余春日[1] 杨缤维[2] 汪荣凯[2] 程新路[2] 杨向东[2] 

机构地区：[1]安庆师范学院物理与电气工程学院,安徽安庆246011 [2]四川大学原子与分子物理研究所,四川成都610065

出　　处：《四川师范大学学报（自然科学版）》2007年第6期765-771,共7页Journal of Sichuan Normal University（Natural Science）

基　　金：国家自然科学基金(10676025;10574096);安徽省高等学校省级自然科学研究基金资助项目

摘　　要：针对He-HCl碰撞体系的3种不同势能模型,采用公认的精确度较高的密耦(close-coupling)近似方法,分别计算了He-HCl体系的微分散射截面、分波散射截面和总截面;并对计算结果进行了比较及分析.研究表明:势能球平均零点能位置、势阱深度、排斥势的强度以及势能在势阱附近的方向性都对散射截面特别是激发截面有较大的影响.从而为根据散射截面准确地确定He-HCl碰撞体系的相互作用势提供了一种新方法.The differential, partial and total scattering cross sections for collisions between He atoms and HCl molecules are calculated by using close-coupling （CC） method under three different potential models, respectively. And the results of the calculation are compared in detail. The resalt shows that the scattering cross sections, particularly excitation cross sections, are sensitive to the position where potential is zero, the well depth, the strength of the repulsive wall of the spherically averaged, and the anisotropy of the region of the well depth. Therefore, a new method is offered for determining exactly the interaction potential of He-HCl system from the scattering cross sections.

关 键 词：势能模型 密耦近似 散射截面 

分 类 号：O561.5[理学—原子与分子物理]