Comparison experiments of neon and helium buffer gases cooling in trapped Hg-199(+) ions linear trap
Comparison experiments of neon and helium buffer gases cooling in trapped Hg-199(+) ions linear trap
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DOI：
10.1088/1674-1056/23/9/093702
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发表时间：
2014-09
影响因子：
1.7
通讯作者：
Yang Yu-na;Liu Hao;He Yue-hong;Yang Zhihui;Wang Man;Chen Yihe;S. Lei;Li Jiao-mei
中科院分区：
文献类型：
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作者：
Yang Yu-na;Liu Hao;He Yue-hong;Yang Zhihui;Wang Man;Chen Yihe;S. Lei;Li Jiao-mei
比较了不同缓冲气体氖和氦对Hg-199（+）线性阱中Hg-199（+）时钟跃迁的影响。利用时域Ramsey分离振荡场技术，测量了Hg-199（+）时钟跃迁的缓冲气体压力频移：氖为（df/dP（Ne））（1/f）= 1.8 × 10 ~（-8）Torr（-1），氦为（df/dP（He））（1/f）= 9.1 × 10 ~（-8）Torr（-1）。同时，在相同气压下，以氖为缓冲气体的Hg-199（+）时钟跃迁谱线宽度比以氦为缓冲气体的窄。这些实验结果表明，由于Hg-199（+）时钟跃迁对氖的变化不太敏感以及氖的冷却效果较好，氖比氦更适合作为Hg-199（+）离子微波频标的缓冲气体。在我们的线性离子阱系统中，氖的最佳工作压力约为1.0 × 10（-5）托。
The influences of different buffer gas, neon and helium, on Hg-199(+) clock transition are compared in trapped Hg-199(+) linear trap. By the technique of time domain's Ramsey separated oscillatory fields, the buffer gas pressure frequency shifts of Hg-199(+) clock transition are measured to be (df/dP(Ne)) (1/f) = 1.8 x 10(-8) Torr(-1) for neon and (df/dP(He)) (1/f) = 9.1 x 10 8 Torr(-1) for helium. Meanwhile, the line-width of Hg-199(+) 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 Hg-199(+) ions microwave frequency standards because of the Hg-199(+) 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 x 10(-5) Torr in our linear ion trap system.