K-Li冷碰撞散射特性的理论研究  

Theoretical reasearch of scattering properties for K-Li cold collisions

作　　者：张计才[1] 杨聚宝[1] 孙金锋[1,2] 

机构地区：[1]河南师范大学物理与电子工程学院,新乡453007 [2]洛阳师范学院物理与电子信息学院,洛阳471022

出　　处：《原子与分子物理学报》2013年第4期597-601,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11274097);河南省教育厅自然科学基金(13B140086)

摘　　要：本文应用量子方法和半经典方法计算了表征锂(6 Li,7 Li)原子和钾(39 K,40 K,41 K)原子间超冷碰撞特性的散射参数,如s波散射长度,有效力程,p波散射长度等.超冷温度下6 Li-39 K单重态和三重态原子间的弹性散射截面主要为s波贡献,随着碰撞能量的增加散射截面有丰富的形状共振出现,计算发现单重态和三重态散射截面均存在显著的i波形状共振.此外,本文应用简并内态近似获得了超精细态相互作用时的s波散射长度.This paper reports the calculations of the scattering parameters for collision between lithium（6Li,7Li） and potassium（39K,40K,41K） atoms at ultracold temperatures,such as s-wave scattering lengths,effective ranges and p-wave scattering lengths,by the quantum method and semiclassical method,respectively.The elastic scattering cross sections for 6Li-39K at ultracold temperatures are dominated by s-wave scattering,and shape resonances occur with the increasing collision energy.There exist pronounced i-wave shape resonances for both the singlet and triplet states cross sections.In addition,s-wave scattering lengths are calculated by using the Degenerate Internet State approximation for selected hyperfine states of K-Li.

关 键 词：冷原子碰撞 散射参数 简并内态近似 

分 类 号：O562.5[理学—原子与分子物理]