超冷钠原子弹性散射特性的精确计算  

Accurate calculation of elastic scattering properties of ultracold sodium atoms

作　　者：张计才[1] 朱遵略[1] 孙金锋[1,2] 

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

出　　处：《物理学报》2013年第1期151-155,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11274097);河南省教育厅自然科学基金(批准号:2011A140017)资助的课题~~

摘　　要：基于精确的原子之间相互作用势,系统研究了钠原子在超冷温度下的弹性散射特性,精确计算了钠原子间碰撞时的s波散射长度、有效力程、p波散射长度以及束缚态数目等散射参数.超冷温度下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分别存在显著的f波和i波形状共振.应用简并内态近似方法获得了超精细态相互作用时的s波散射长度,所得结果与精确值比较符合.Based on the accurate singlet and triplet state interatomic potentials for Na2, a theoretical study of elastic scattering properties of sodium atoms at ultracold temperatures is reported in this paper. The s-wave scattering length, effective range, the p-wave scatteringlength and the number of bound states are calculated. The singlet and triplet elastic scattering cross section between sodium aotms at ultracold temperatures are dominated by s-wave scattering, and shape resonances occur with collision energy increasing. Thereexist pronounced f-wave and i-wave shape resonances for the singlet and triplet cross section. In addition, s-wave scattering length is calculated by using the degenerate internet state approximation for selected hyperfine states of sodium atoms. The results are in agreement with calculated values obtained by close-coupling method.

关 键 词：散射参数 弹性散射截面 简并内态近似 

分 类 号：O562.5[理学—原子与分子物理]