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Comparison experiments of neon and helium buffer gases cooling in trapped 199Hg+ ions linear trap |
Yang Yu-Na (杨玉娜)a b, Liu Hao (柳浩)a b, He Yue-Hong (何跃宏)a b, Yang Zhi-Hui (杨智慧)a b, Wang Man (汪漫)a b, Chen Yi-He (陈义和)a, She Lei (佘磊)a, Li Jiao-Mei (李交美)a |
a Key Laboratory of Atomic Frequency Standards (KLAFS), Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China; b University of the Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The influences of different buffer gas, neon and helium, on 199Hg+ clock transition are compared in trapped 199Hg+linear trap. By the technique of time domain's Ramsey separated oscillatory fields, the buffer gas pressure frequency shifts of 199Hg+ clock transition are measured to be (df/d PNe)(1/f)=1.8×10-8 Torr-1 for neon and (df/d PHe)(1/f)=9.1×10-8 Torr-1 for helium. Meanwhile, the line-width of 199Hg+ clock transition spectrum with the buffer gas neon is narrower than that with helium at the same pressure. These experimental results show that neon is a more suitable buffer gas than helium in 199Hg+ ions microwave frequency standards because of the 199Hg+ clock transition is less sensitive to neon variations and the better cooling effect of neon. The optimum operating pressure for neon is found to be about 1.0×10-5 Torr in our linear ion trap system.
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Received: 17 January 2014
Revised: 07 March 2014
Accepted manuscript online:
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PACS:
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37.10.Rs
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(Ion cooling)
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37.10.Ty
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(Ion trapping)
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32.70.Jz
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(Line shapes, widths, and shifts)
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34.50.Cx
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(Elastic; ultracold collisions)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11074248). |
Corresponding Authors:
Yang Yu-Na, She Lei, Li Jiao-Mei
E-mail: yangyuna189@126.com;shelei@wipm.ac.cn;jmlee@wipm.ac.cn
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Cite this article:
Yang Yu-Na (杨玉娜), Liu Hao (柳浩), He Yue-Hong (何跃宏), Yang Zhi-Hui (杨智慧), Wang Man (汪漫), Chen Yi-He (陈义和), She Lei (佘磊), Li Jiao-Mei (李交美) Comparison experiments of neon and helium buffer gases cooling in trapped 199Hg+ ions linear trap 2014 Chin. Phys. B 23 093702
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