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超冷温度下钾和铯原子间弹性散射特性的精确计算
Accurate calculation of elastic scattering properties of potassium and cesium atoms at ultracold temperatures
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摘要: 本文分别用量子方法和半经典方法计算了超冷钾和铯原子之间弹性碰撞的s波散射长度,有效力程和P波散射长度等散射参数.超冷温度下^39K-^133Cs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截面分别存在显著的g波和d波形状共振.另外,本文应用简并内态近似方法获得了^41K-^133Cs超精细态相互作用时的s波散射长度.Abstract: In this paper,we calculate the scattering parameters for collision between potassium and cesium atoms at ultracold temperatures, such as s-wave scattering length,effective range and p-wave scattering length,by the quantum method and semiclassical method, respectively.The singlet and the triplet elastic scattering cross sections between ^39K and Cs atoms at ultracold temperatures are dominated by s-wave scattering,and shape resonance occurs with the increase of collision energy.There exist pronounced g-wave and d-wave shape resonances for the singlet and the triplet cross sections,respectively.In addition,s-wave scattering lengths are calculated by using the degenerate internet state approximation for selected hyperfine states of ^41KCs.
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