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Chinese Physics Letters

Fluorescence Detection and Buffer Gas Cooling of Trapped Mercury Ions in Paul Trap

余磊, 王文明, 白磊, 孙焕尧, 朱熙文, 李交美, 高克林

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

Hg 离子在一个 hyperboloid 离子陷井被限制。用 rf 分泌物 Hg-202 同位素灯，套住的 Hg 离子的荧光信号被观察。借助于缓冲区气体冷却，离子的温度被减少。作为结果，套住的时间被增加，荧光灯的信号的 signal-to-noise 比率(SNR ) 被改进。离子云的温度被测量空间费用移动估计。

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Hg 离子在一个 hyperboloid 离子陷井被限制。用 rf 分泌物 Hg-202 同位素灯，套住的 Hg 离子的荧光信号被观察。借助于缓冲区气体冷却，离子的温度被减少。作为结果，套住的时间被增加，荧光灯的信号的 signal-to-noise 比率(SNR ) 被改进。离子云的温度被测量空间费用移动估计。
Buffer gas cooling is the most effective and practical method to cool ions in ion trap.The kind and quantity of buffer gas are the key technologies in mercury ion microwave frequency standard experiments.Buffer gas made of helium,neon or argon was studied to cool trapped mercury ions(~(199)Hg~+) in a linear ion trap by introducing a resistance term in Mathieu's equation.It's found that the decay time of motion of ~(199)Hg~+ in argon gas is the shortest,and the frequency shift of the clock transition(40.5 GHz) is minimum when the pressure of helium is 10~(-5) Torr or the pressure of neon gas is 2.4×10~(-5) Torr.Neon is the most suitable buffer gas among helium,neon and argon,considering the decay time-constant of motion of ~(199)Hg~+ in buffer gases and ~(199)Hg~+ clock transition shift's sensitivity to the change of the pressure of buffer gas.
Singly ionized mercury ions have been stored in a miniature rf (Paul) quadruple ion trap and observed by means of resonance fluorescence. The trap electrode spacings (~0.5 mm) and rf voltage (~500 V at 20 MHz) were chosen1 so that the Lamb-Dicke criterion could be satisfied for optical transitions on a single-laser-cooled ion. The presence of a single ion was determined by a statistical loading method2; that is, the loading conditions were scaled down to a point where only occasionally would any fluorescence be observed after a loading cycle. With high probability, this fluorescence was due to a single ion. The fluorescence observed was due to spontaneous scattering from a 194-nm cw source (~3-μW power focused to a beam waist of ~20 μm) directed at the ion and tuned near the strongly allowed first resonance line.