高转动态的亚稳Feshbach分子
Metastable Feshbach Molecules in High Rotational States
摘要：
我们的实验表明CS2 Feshbach分子远高于解离阈值，这是稳定的自发衰变的时间尺度上的一秒钟。超冷二聚体的光学捕获样品在l波状态下制备，并磁调谐到具有负结合能的区域。这些分子的亚稳特性来自于大的离心势垒，结合与低旋转角动量状态的可忽略不计的耦合。随着磁场的增加，解离的急剧开始由与g波二聚体状态的交叉介导，并且促进了具有明确定义的能量的按需解离。
英文摘要：
We experimentally demonstrate Cs2 Feshbach molecules well above the dissociation threshold, which are stable against spontaneous decay on the timescale of one second. An optically trapped sample of ultracold dimers is prepared in an l-wave state and magnetically tuned into a region with negative binding energy. The metastable character of these molecules arises from the large centrifugal barrier in combination with negligible coupling to states with low rotational angular momentum. A sharp onset of dissociation with increasing magnetic field is mediated by a crossing with a g-wave dimer state and facilitates dissociation on demand with a well defined energy.
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