Stark deceleration of lithium hydride molecules
Stark deceleration of lithium hydride molecules
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DOI：
10.1088/1367-2630/11/5/055038
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发表时间：
2008-12
影响因子：
3.3
通讯作者：
S. Tokunaga;J. Dyne;E. Hinds;M. Tarbutt
中科院分区：
文献类型：
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作者：
S. Tokunaga;J. Dyne;E. Hinds;M. Tarbutt
我们描述了冷的、缓慢移动的 LiH 分子的生产。这些分子是通过激光烧蚀和超音速膨胀在基态下产生的，并且使用 444 GHz 旋转频率的窄带辐射将 68% 的分子转移到旋转激发态。然后使用 100 级 Stark 减速器将分子从 420 m s−1 减速到 53 m s−1。我们演示并比较了两种不同的减速模式，一种是每个阶段都用于减速，另一种是每第三阶段减速一次，中间阶段用于更有效地聚焦分子。我们将实验数据与模拟结果进行比较，发现非常吻合。这些模拟包括检测效率的速度依赖性以及弱场搜索和强场搜索量子态之间的转变概率。实验数据和模拟数据共同提供了有关分子源的空间范围的信息。我们考虑了未来捕获和交感冷却实验的前景。
We describe the production of cold, slow-moving LiH molecules. The molecules are produced in the ground state using laser ablation and supersonic expansion, and 68% of the population is transferred to the rotationally excited state using narrowband radiation at the rotational frequency of 444 GHz. The molecules are then decelerated from 420 to 53 m s−1 using a 100 stage Stark decelerator. We demonstrate and compare two different deceleration modes, one where every stage is used for deceleration, and another where every third stage decelerates and the intervening stages are used to focus the molecules more effectively. We compare our experimental data to the results of simulations and find good agreement. These simulations include the velocity dependence of the detection efficiency and the probability of transitions between the weak-field seeking and strong-field seeking quantum states. Together, the experimental and simulated data provide information about the spatial extent of the source of molecules. We consider the prospects for future trapping and sympathetic cooling experiments.