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。

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.