分区式线型阱中囚禁199Hg+离子钟跃迁谱线二级塞曼频移测量

The second-order Zeeman shift of the clock transition frequency in magnetic field is one of the major factor which effects the performance of 199Hg+ ion microwave standard.So the precise measure of this shift is significant to improve the long term stability of 199Hg+ ion microwave frequency standard. In this project,we will use the ion shuttling skill to transport the 199Hg+ to the microwave interrogation region with higher shielding factors and then interact with microwave field in this zone.And we will measure the magnetic field accurately by using the non first-order Doppler broadening Zeeman spectral lines of the ΔF=1,ΔmF=±1 transitions in the 199Hg+ groundstate hyperfine energy level. Also in this project,the high-precision frequency of the clock transition of the 199Hg+ will be obtained by Ramsey method. And then the second-order Zeeman shift of 199Hg+ clock transition can be calculated more precisely. All of the work in this project is to lay the foundation for improving the long term stability of trapped 199Hg+ ion microwave clock.

囚禁199Hg+离子钟跃迁谱线在磁场中的二级塞曼频移是影响线型阱199Hg+离子频标性能的主要的物理效应之一。对其进行精密测量，对改善和提高199Hg+离子微波频标长期稳定度有重要意义。本申请项目拟在分区式线型离子阱中，利用囚禁离子传输技术，将199Hg+离子传输到磁屏蔽因子较高的微波探询区，与微波场相互作用；利用无一级多普勒增宽的199Hg+离子基态ΔF=1，ΔmF=±1的塞曼跃迁谱线，实现对磁场精确测量；利用Ramsey方法得到窄线宽钟跃迁谱线，实现对钟跃迁频率的精确测量。进而得出高精度的囚禁199Hg+离子钟跃迁谱线塞曼频移。为改善囚禁199Hg+离子微波钟长期稳定性奠定基础。

线型阱199Hg+离子微波频标是一种新型频标，因其高性能指标而受到重视。被看成下一代守时和导航用频标候选对象。 在线型阱199Hg+离子微波频标中，囚禁199Hg+离子在磁场中的二级塞曼频移是影响199Hg+离子钟跃迁谱线的主要的物理效应之一。对其进行精密测量，对改善和提高199Hg+离子微波频标长期稳定度有重要意义。.本研究项目，搭建了分区式线型阱物理系统，得到了囚禁199 Hg + 离子在分区式线型离子阱区域之间的往返传输所需的囚禁场相位及幅度条件，并对实验结果进行了理论分析；研究了的199 Hg+离子基态超精细能级的塞曼跃迁谱；研究了线型阱中，时域分离振荡（Ramsey）技术获得窄线宽钟跃迁谱线的方法，得到到囚禁199 Hg+离子钟跃迁谱线的二级塞曼频移。.利用该项目的研究成果和技术经验，我们实现了国内首台小型化汞离子微波钟的闭环锁定，其天稳达到了2.6E-15水平。这一结果，为实现汞离子微波钟星载和地面守时奠定了良好的实验基础。

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