| ATOMIC AND MOLECULAR PHYSICS |
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Measurement of the Low-Energy Rb$^+$–Rb Total Collision Rate in an Ion-Neutral Hybrid Trap |
| Shuang-Fei Lv1, Feng-Dong Jia1, Jin-Yun Liu1, Xiang-Yuan Xu2,3, Ping Xue2**, Zhi-Ping Zhong1** |
1School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049
2State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, and Collaborative Innovation Center of Quantum Matter, Beijing 100084
3Department of Physics, Capital Normal University, Beijing 100037
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| Cite this article: |
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Shuang-Fei Lv, Feng-Dong Jia, Jin-Yun Liu et al 2017 Chin. Phys. Lett. 34 013401 |
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Abstract An ion–neutral hybrid trap is built to study low-energy ion–atom collisions. The ion–neutral hybrid trap is combined with two spatially concentric traps: a linear Paul trap for the ionic species and a magneto-optical trap (MOT) for the neutral species. The total ion–atom collision rate coefficient $k_{\rm ia}$ between$^{87}$Rb atoms and optically dark $^{87}$Rb$^+$ ions is measured by monitoring the reduction of the steady-state MOT atoms by sequentially introducing various mechanisms, namely photoionization and ion–atom collisions. In contrast to other experiments, a concise experimental procedure is devised to obtain the loss rates of the MOT atoms due to photoionization and ion–atom collisions in one experimental cycle, and then the collision rate $k_{\rm ia}$ of cold $^{87}$Rb atoms with $^{87}$Rb$^+$ ions is deduced to $0.94(\pm0.24)\times10^{-13}$ m$^3$/s with $T_{\rm i}=3770(\pm100)$ K measured by the time of flight of the ion signal. The measurements show good agreement with the collision rate derived from the Langevin model.
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Received: 01 September 2016
Published: 29 December 2016
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| PACS: |
34.50.Cx
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(Elastic; ultracold collisions)
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34.80.Dp
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(Atomic excitation and ionization)
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34.90.+q
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(Other topics in atomic and molecular collision processes and interactions)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11604334, 61227807 and 61575108, and the Tsinghua Initiative Scientific Research Program under Grant No 2013THZ02-3, and the Beijing Natural Science Foundation under Grant No 1164016. |
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