冷碱土原子光缔合谱中的亚热线宽
Subthermal linewidths in photoassociation spectra of cold alkaline earth atoms
摘要：
预测了碱土金属冷原子^1Pi_g光缔合光谱具有亚热宽度的窄s波特征。通过数值计算和解析计算解释了这一现象。这些结果表明，只有一个小的亚热范围内的碰撞能量阈值附近的s-波的功能，激发时，原子是非常遥远的贡献。共振在热平均后仍然存在，并且对于在4^1P <-4^1S激光冷却转变的多普勒冷却温度附近冷却的Ca，可以检测到共振。
英文摘要：
Narrow s-wave features with subthermal widths are predicted for the ^1Pi_g photoassociation spectra of cold alkaline earth atoms. The phenomenon is explained by numerical and analytical calculations. These show that only a small subthermal range of collision energies near threshold contributes to the s-wave features that are excited when the atoms are very far apart. The resonances survive thermal averaging, and may be detectable for Ca cooled near the Doppler cooling temperature of the 4^1P <- 4^1S laser cooling transition.
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