Photoassociative spectroscopy of ultracold 39K atoms in a high-density vapor-cell magneto-optical trap.
Photoassociative spectroscopy of ultracold 39K atoms in a high-density vapor-cell magneto-optical trap.
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DOI：
10.1103/physreva.53.r1216
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发表时间：
1996-03
期刊：
影响因子：
--
通讯作者：
Hao Wang;PL Gould;W. Stwalley
中科院分区：
文献类型：
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作者：
Hao Wang;PL Gould;W. Stwalley
我们在高密度蒸汽室磁光陷阱(MOT)中进行了超冷钾原子的光缔合光谱，在MOT中，原子主要被限制在与陷阱光不相互作用的“暗”超精细能级中。在低于4P322原子极限的8 cm−1范围内，观察到K239分子的三个分辨良好的振动序列(一个强，两个弱)。其中一个系列被确定为0g−纯长程态，另外两个系列被指定为0u+和1g态。这些光缔合光谱是通过测量由于强光缔合激光引起的陷阱损失而引起的陷阱荧光的减少而获得的。通过使用蒸汽池暗量子光学技术，我们获得了大于1011 cm−3的原子密度，与普通量子光学技术相比，我们的陷阱损耗信号增加了一个数量级。
We have performed photoassociative spectroscopy of ultracold potassium atoms in a high-density vapor-cell magneto-optical trap (MOT) in which atoms are confined predominantly in" dark" hyperfine levels that do not interact with the trapping light. Three well-resolved vibrational series (one strong and two weak) of the K 2 39 molecule are observed within 8 cm− 1 below the 4 P 3 2 2 atomic limit. One of the series is identified as the 0 g− pure long-range state and the other two are assigned to the 0 u+ and 1 g states. These photoassociative spectra are obtained by measuring reductions in the trap fluorescence due to trap loss induced by an intense photoassociation laser. By using a vapor-cell-dark MOT technique, we achieve atomic densities greater than 10 11 cm− 3, increasing our trap loss signals by an order of magnitude compared to a normal MOT.