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A novel non-linear ion mirror with only three elements

机译：一种只有三个元素的新型非线性离子镜

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摘要

A novel tubular ion mirror has been designed for reflectron time-of-flight mass spectrometry (TOF-MS). This design consists of only three cylindrical elements. With this mirror, an electric field is achieved that is non-linear along the mirror axis and has improved off-axis homogeneity compared with conventional simple geometry ion mirrors. The practical operation of this mirror is simpler than that of conventional diaphragm ion mirrors. Design parameters, including the relative lengths and voltages of the three elements, can be determined empirically. Once the mirror depth dimensions have been implemented, the voltages of the middle and rear elements are the only adjustable parameters. The electric field achieved by the mirror deviates only slightly from a linear mirror with constant field strength. The second-order deviation curve reveals two regions of curvature; all ions are turned around in the second curvature region. A plot of arrival time vs ion kinetic energy has a flattened "S" shape. The aspects of this shape are affected by the voltages of the middle and rear elements. SIMION 7 simulation demonstrates that this new non-linear ion mirror can perform second-order kinetic energy correction for large kinetic energy variation (33%) and substantial beam dimensions. Both the ion kinetic energy variation and the mirror element voltages affect the mass resolution obtained with the mirror. Ion trajectory simulations with a 10 mm diameter beam from a standard, two-field source predict that baseline resolution can be 16, 000, 7600 and 1200 for 15%, 26% and 33% kinetic energy variations, respectively.
机译：一种新颖的管状离子镜已经设计用于反射电子飞行时间质谱（TOF-MS）。此设计仅包含三个圆柱元素。与传统的简单几何离子镜相比，使用该镜可实现沿镜轴呈非线性并改善离轴均匀性的电场。该反射镜的实际操作比常规的隔膜离子反射镜更简单。设计参数，包括三个元素的相对长度和电压，可以凭经验确定。一旦实现了镜面深度尺寸，则中间和后部元件的电压是唯一可调节的参数。反射镜获得的电场与具有恒定场强的线性反射镜仅略有偏离。二阶偏差曲线显示了两个曲率区域。所有离子都在第二曲率区域内转过身。到达时间与离子动能的关系图具有平坦的“ S”形。这种形状的各个方面受中间和后部元件的电压影响。 SIMION 7仿真表明，这种新型非线性离子镜可对较大的动能变化（33％）和较大的射束尺寸进行二阶动能校正。离子动能变化和镜面元件电压都影响镜面所获得的质量分辨率。来自标准两场源的直径为10 mm的离子束的离子轨迹模拟预测，对于15％，26％和33％的动能变化，基线分辨率分别为16、000、7600和1200。

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