Comparison experiments of neon and helium buffer gases cooling in trapped 199Hg+ ions linear trap

doi:10.1088/1674-1056/23/9/093702

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 P_Ne)(1/f)=1.8×10^-8 Torr^-1 for neon and (df/d P_He)(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.

Keywords: ion cooling ion trapping line shape widths and shifts elastic collisions

Received: 17 January 2014
Revised: 07 March 2014
Accepted manuscript online:

PACS:	37.10.Rs	(Ion cooling)
	37.10.Ty	(Ion trapping)
	32.70.Jz	(Line shapes, widths, and shifts)
	34.50.Cx	(Elastic; ultracold collisions)

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

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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Comparison experiments of neon and helium buffer gases cooling in trapped 199Hg+ ions linear trap

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Comparison experiments of neon and helium buffer gases cooling in trapped ¹⁹⁹Hg⁺ ions linear trap