用于离子捕获和冷却的线电极四极杆离子阱的设计与仿真  

Design and Simulation of a Wire Quadrupole Ion Trap for Ion Trapping and Cooling

作　　者：李泽楷 周逸杰 董常武 侯高垒 Ze-Kai Li;Yijie Zhou;Changwu Dong;Gao-Lei Hou(MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter,School of Physics,Xi’an Jiaotong University,Xi’an 710049,China;Key Laboratory of Interfacial Physics and Technology,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;School of Physics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]西安交通大学物理学院,物质非平衡合成与调控教育部重点实验室,西安710049 [2]中国科学院上海应用物理研究所,微观界面物理与探测重点实验室,上海201800

出　　处：《Chinese Journal of Chemical Physics》2024年第2期137-146,I0101,共11页化学物理学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(No.22273070 and No.92261101);the Innovation Capability Support Program of Shaanxi Province(2023-CX-TD-49)。

摘　　要：射频离子阱作为离子捕获系统的核心器件,广泛应用于化学反应动力学、原子分子物理、精密测量和离子光谱等领域.离子阱可以与低温制冷机相结合,将离子储存、富集并冷却至低温,从而为后续实验提供极大便利,例如高分辨光谱学。本文详细描述了一种射频线电极四极杆离子阱的结构设计,该离子阱利用六个线电极作为传统四极杆离子阱的一个圆柱形电极模拟双曲面.研究模拟了离子阱内的电场分布和离子运动轨迹,用以考察所设计的射频线电极四极杆离子阱的性能,研究表明它能够将离子囚禁束缚在一个很小的空间.基于所设计的离子阱支撑部件、离子阱腔体、电极和印刷电路板,结合所选择的材料进行了传热学模拟。模拟的温度分布表明,所设计的射频线电极四极杆离子阱与液氢低温制冷机结合使用,可以将离子冷却到5K以下的低温.这项工作将有助于推动离子阱技术在精密光谱学中的应用。Serving as the core device of an ion trapping system,radiofrequency ion traps are widely employed in chemical reaction dynamics,atomic and molecular physics,precise measurement,and ion spectroscopy.They can store,enrich,and cool ions down to very low temperatures in combination with a cryogenic cooler,thus greatly facilitating the following experiments,such as,high-resolution spectroscopy.In this work,we describe in detail the structural design of a radiofrequency wire quadrupole trap(w4PT)that utilizes six wire electrodes to act as one cylindrical electrode of the conventional quadrupole ion trap to simulate the hyperboloids.We simulated the electric fields and ion motion trajectories within the trap to investigate the performance of the designed w4PT,and showed that it is capable of reaching a tight confinement of ions in a small volume.We also conducted the heat transfer simulations based on the designed supporting platform for the trap,and the chosen materials for the electrodes,trap cavity,and printed circuit boards for installing the electrodes.The simulated temperature distributions showed that the current trap could cool ions to a low temperature below 5 K using a helium cryogenic cooler.This work shall be helpful for the development of ion trap technology to be employed in high-precision spectroscopy.

关 键 词：射频离子阱 线电极四极杆离子阱 缓冲气体冷却 低温制 冷机 

分 类 号：O646[理学—物理化学]