宇航计测技术 ›› 2024, Vol. 44 ›› Issue (5): 68-75.doi: 10.12060/j.issn.1000-7202.2024.05.11

• 精密测试技术 • 上一篇    下一篇

保罗离子阱中离子二阶多普勒频移评估

苗胜楠1,2，郑莹1,3，张升康4，陈海军5，张建伟1,2,*，王力军1,2,3   

  1. 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
  • 出版日期:2024-10-15 发布日期:2024-11-12
  • 作者简介:苗胜楠（1997-），男，博士研究生，主要研究方向：微波量子频标、分子动力学仿真、离子相变技术。

Second-order Doppler Frequency Shifts of Ions in Paul Traps

MIAO Shengnan1,2，ZHENG Ying1,3，ZHANG Shengkang4，CHEN Haijun5，ZHANG Jianwei1,2,*，WANG Lijun1,2,3   

  1. 1.State Key Laboratory of Precision Space-time Information Sensing Technology,State Key Laboratory of Precision Measurement Technology and Instruments,Beijing 100084,China;
    2.Department of Precision Instruments,Tsinghua University,Beijing 100084,China;
    3.Department of Physics,Tsinghua University,Beijing 100084,China;
    4.Beijing Institute of Radio Metrology and Measurement,Beijing 100039,China;
    5.Beijing Institute of Vacuum Electronic Technology,Beijing 100015,China
  • Online:2024-10-15 Published:2024-11-12

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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。

关键词: 多普勒频移, 分子动力学, 离子阱

Abstract: 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.

Key words: Doppler frequency shift, Molecular dynamics, Ion trap

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