双势阱平面离子阱的设计与模拟研究  

Design and Simulation of a Double Potential Well Flat Ion Trap

作　　者：王新宇 任熠 洪义 黄奇 陈政阁 袁立永[3] 黄正旭 李梅 周振 WANG Xin-yu;REN Yi;HONG Yi;HUANG Qi;CHEN Zheng-ge;YUAN Li-yong;HUANG Zheng-xu;LI Mei;ZHOU Zhen(Institute of Mass Spectrometry and Atmospheric Environment,Jinan University,Guangzhou 510632,China;Guangzhou Hexin Instrument Co.,Ltd,Guangzhou 510530,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]暨南大学质谱仪器与大气环境研究所,广东广州510632 [2]广州禾信仪器股份有限公司,广东广州510530 [3]中国科学院高能物理研究所,北京100049

出　　处：《质谱学报》2023年第1期34-45,共12页Journal of Chinese Mass Spectrometry Society

基　　金：国家自然科学基金项目——国家重大科研仪器研制项目(21319002)。

摘　　要：双势阱平面离子阱作为离子收集与聚焦装置,2个势阱可分别实现进入离子的收集和约束离子的可控冷却及抛出,相比于单势阱平面离子阱,其对离子的收集与聚焦更加充分。本工作利用SIMION 8.1离子光学模拟软件,研究离子阱工作的4个阶段,即离子收集、离子转移、离子冷却和离子抛出。模拟得到离子阱的工作周期可从1 ms延长至超过10 ms,总离子传输效率为83%,离子通量上限达1.6×10^(6)个。此外,充分冷却的离子从离子阱中抛出,具有1.0、1.0 mm的径向直径,24 mrad、16 mrad的角度标准偏差,15 eV的能量标准偏差。双势阱平面离子阱的工作周期、离子通量、抛出离子均满足多次反射飞行时间质量分析器的工作需要,并可与其耦合,为其提供通量高、状态集中的引入离子。A double potential well flat ion trap was designed as an ion accumulating and focusing device for multi-reflection time-of-flight mass analyzer.Two potential wells of the trap were severally used for accumulation of injected ions,controlled cooling and ejection of trapped ions,which had features to accumulate ions continuously and cool ion for almost one period.While a flat ion trap with only one potential well is a traditional and excellent ion accumulating and focusing device,which has an intermittent ion accumulation and an ion cooling around half period.Compared with the single potential well flat ion trap,the double potential well flat ion trap had better performance on ion accumulation and focusing in principle.Four steps to run the trap were simulated and researched by an ion optics simulator of SIMION 8.1.The first step was ion accumulation,ions were successively injected into the trap,and then stored and accumulated in the first potential well.The second step was ion transfer,the trapped ions were transferred from the first potential well to the second potential well.The third step was ion cooling,the trapped ions were confined in the second potential well,and were simultaneously cooled by collisions with 0.5 Pa He.The fourth step was ion ejection,the trapped ions were ejected from the trap and focused into the next device.Ion optics simulations indicated that the trap had a period from 1 ms to above 10 ms,a total ion transmission efficiency of 83%,and an ion flux of at most 1.6×10^(6) ions.In addition,ion packets ejected from the trap had thermalized with radial diameters of 1.0 and 1.0 mm,angular standard deviations of 24 mrad and 16 mrad,and an energy standard deviation of 15 eV.This trap can be coupled with and provide high-flux and full-focusing ion packets for multi-reflection time-of-flight mass analyzers,due to an excellent suitability between the operation of the analyzer and the period,the ion transmission efficiency,the ion flux,and ejected ion packets of the trap.

关 键 词：离子阱 势阱 离子光学模拟 质量分析器 

分 类 号：O657.63[理学—分析化学]