Ultra-stable Hg+
Ultra-stable Hg+
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DOI：
10.1080/09500349214550231
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发表时间：
1992-02
影响因子：
1.3
通讯作者：
J. Prestage;R. Tjoelker;G. Dick;L. Maleki
中科院分区：
文献类型：
--
作者：
J. Prestage;R. Tjoelker;G. Dick;L. Maleki
本文报道了一种基于199 Hg ~+离子的可现场频率标准的研制。直流线性离子阱。这种陷阱允许存储大量的离子，其对由r.f.引起的二阶多普勒效应的敏感性降低。封闭场40·5 GHz时钟跃迁的160 mHz宽原子共振线用于控制5 MHz晶体振荡器的输出，以获得2 × 10−15的稳定性，平均时间为24 000 s。对于较长的平均时间间隔，测量受到现有氢脉泽频率标准不稳定性的限制。在Hg+时钟跃迁的37 mHz线宽下的测量表明，该频率标准的固有稳定性至少为1 × 10−15。
Abstract We report the development of a fieldable frequency standard based on 199Hg+ ions confined in a hybrid r.f./dc linear ion trap. This trap permits storage of large numbers of ions with reduced susceptibility to the second-order Doppler effect caused by the r.f. confining fields. A 160 mHz wide atomic resonance line for the 40·5 GHz clock transition is used to steer the output of a 5 MHz crystal oscillator to obtain a stability of 2 × 10−15 for 24 000 s averaging times. For longer averaging intervals, measurements are limited by instabilities in available hydrogen maser frequency standards. Measurements with 37 mHz linewidth for the Hg+ clock transition demonstrate that the inherent stability for this frequency standard is at least as good as 1 × 10−15.