保罗离子阱中离子二阶多普勒频移评估  

Second-order Doppler Frequency Shifts of Ions in Paul Traps

作　　者：苗胜楠 郑莹 张升康 陈海军[5] 张建伟 王力军 MIAO Shengnan;ZHENG Ying;ZHANG Shengkang;CHEN Haijun;ZHANG Jianwei;WANG Lijun(State Key Laboratory of Precision Space-time Information Sensing Technology,State Key Laboratory of Precision Measurement Technology and Instruments,Beijing 100084,China;Department of Precision Instruments,Tsinghua University,Beijing 100084,China;Department of Physics,Tsinghua University,Beijing 100084,China;Beijing Institute of Radio Metrology and Measurement,Beijing 100039,China;Beijing Institute of Vacuum Electronic Technology,Beijing 100015,China)

机构地区：[1]时空信息精密感知技术全国重点实验室,精密测试技术及仪器国家重点实验室,北京100084 [2]清华大学精密仪器系,北京100084 [3]清华大学物理系,北京100084 [4]北京无线电计量测试研究所,北京100039 [5]中国电子科技集团公司第十二研究所,北京100015

出　　处：《宇航计测技术》2024年第5期68-73,共6页Journal of Astronautic Metrology and Measurement

摘　　要：主要研究了保罗离子阱中被囚禁离子二阶多普勒频移(The Second-order Doppler Frequency Shift,SODFS)的评估。保罗阱中离子的运动由宏运动、微运动和额外微运动三部分组成。目前,关于离子额外微运动的研究较少,文中对此进行了详细研究。基于离子密度在径向均匀分布的假设,文中提出了一种用于评估阱中温度低于100 mK离子系综的二阶多普勒频移的模型。该模型考虑了离子三种运动对二阶多普勒频移的贡献。通过实验以及分子动力学仿真,验证了模型的有效性。文中提出的模型能用于评估保罗阱中被囚禁离子的二阶多普勒频移,适用于离子光钟、离子微波钟,尤其适用于基于大离子云的激光冷却离子微波钟。The evaluation of the second-order Doppler frequency shift(SODFS)of trapped ions in Paul traps has been studied in this paper.The motion of confined ions in a Paul trap consists of three components:secular motion,micromotion,and excess micromotion.This paper focused on the ion excess micromotion,which is rarely discussed when evaluating the SODFS of ions.Based on the hypothesis that the ion density is uniformly distributed in the radial direction,a model was proposed to evaluate the total SODFS for an ion ensemble with temperature less than 100 mK in this paper,which consists of three contributions of ion motion.The effectiveness of the model has been verified by molecular dynamics simulations and experiments.The model in this paper offers advantages in accurately evaluating the SODFS for the ion trap,which is appliable for optical clocks based on ions and microwave clocks based on ions,especially those of laser-cooled ion microwave clocks based on large ion clouds.

关 键 词：多普勒频移 分子动力学 离子阱 

分 类 号：TM12[电气工程—电工理论与新技术]