Simple cylindrical ion mirror with three elements.
Simple cylindrical ion mirror with three elements.
复制标题
具有三个元件的简单圆柱形离子镜。
DOI：
10.1016/s1044-0305(00)00145-8
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发表时间：
2000
影响因子：
3.2
通讯作者：
Enke,CG
中科院分区：
文献类型：
--
作者：
Zhang,J;Enke,CG
一种新的圆柱形离子镜被设计用于为通用飞行时间质谱仪产生非线性或沿飞行路径轴弯曲的电场。发现包含一个或两个网格可以改善径向场均匀性，尤其是在孔径周围。设计中仅使用了三个圆柱形电极。改变电极尺寸和电压会影响电场分布。一旦电极尺寸固定，就只有两个可调节参数来实现最佳非线性电场形状。动能变化分别为 34% 和 10.5%，分辨率达到 7000 和 16 100。模拟表明，径向方向的电场均匀性使得能够使用直径高达 15 毫米的离子束，而分辨率损失很小。增加反射镜直径可以进一步增加实际离子束直径。本文详细介绍了柱面镜内轴向和径向的电场分布。中电极和后电极的电压影响分辨率和可以实现聚焦的动能范围。 singlem/z 值的预测到达时间分布比气相离子源中离子的周转时间引起的分布更窄。在这种情况下，实现良好聚焦的宽能量范围使得能够使用更高的提取场来减少周转时间。
A new cylindrical ion mirror has been designed to create an electric field that is non-linear or curved along the flight path axis for general-purpose time-of-flight mass spectrometers. The inclusion of one or two grids is found to improve the radial field homogeneity especially around the aperture. Only three cylindrical electrodes are used in the design. Changing the electrode dimensions and voltages affects the electric field distribution. Once the electrode dimensions are fixed, there are only two adjustable parameters for achieving optimum nonlinear electric field shape. Resolving powers of 7000 and 16 100 have been achieved with kinetic energy variations of 34 and 10.5%, respectively. Simulations show that the electric field homogeneity in the radial direction enables the use of ion beam diameters up to 15 mm with only modest loss of resolving power. Increasing the mirror diameter could further increase the practical ion beam diameter. This article details the electric field distribution within the cylindrical mirror in both axial and radial directions. The voltages of the middle and rear electrodes affect the resolving power and the kinetic energy range over which focus can be achieved. The predicted arrival time spread for a singlem/zvalue is narrower than that caused by the turn-around time of ions in a gas-phase ion source. In this case, the broad energy range over which good focus is achieved enables the use of higher extraction fields for turn-around time reduction.