IMS迁移管内电场分布的均匀性对仪器分辨率的影响  

The Influence of Electric Field Distribution in Drift Tube to IMS Resolution

作　　者：徐淑武[1] 黄云霞[1] 陈浩[2] 陈扬骎[3] 

机构地区：[1]南通大学理学院,江苏南通226007 [2]徐州师范大学物理系,江苏徐州221116 [3]华东师范大学物理系,上海200062

出　　处：《徐州师范大学学报（自然科学版）》2005年第3期53-56,64,共5页Journal of Xuzhou Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10204007)

摘　　要：分辨率是判断离子迁移谱检测仪(IMS)性能优劣的重要指标.其中,离子门初始电压脉冲宽度和离子的扩散效应是影响IMS分辨率的主要因素.通过分析离子门开门时间和迁移管温度的变化与分辨率之间的关系,研究了迁移管内电场分布的均匀性对分辨率的重要影响,对于所使用的仪器,拟合所得的电场不均匀性参数ε大致等于0.1.根据讨论结果可以认为,在IMS仪器中电场分布的不均匀所造成的仪器分辨率降低不能忽略.The resolution of width and diffusion effect,is an IMS, which depends significantly on two factors of the initial ion pulse important index to evaluate the instrument. In the present paper, the influence of electric field distribution in the drift tube on IMS resolution is investigated by analyzing the resolution versus the initial ion pulse width and the temperature of drift tube. To the IMS we used, the inhomogeneity of the electric field ε is fitted to be about 0.1. Thus, we conclude that the inhomogeneity of the electric field to the resolution reducing should not be ignored, especially when the initial ion pulse width is short down to 0.5 ms.

关 键 词：离子迁移谱技术 迁移率 迁移管 分辨率 电场分布 

分 类 号：O453[理学—无线电物理]