【摘要】 离子光学设计是质谱仪器的核心技术,为了提高常规质谱的丰度灵敏度指标,设计了磁-电-四极杆级联质谱,并构建了一台原理实验样机。样机中的离子光学设计是仪器设计的关键内容,尤其是与最后一级质谱相关的离子透镜的设计,与常规双聚焦质谱和四极杆质谱中的透镜均有较大差异。本工作介绍了样机中的总体离子光学设计、四极杆前后相关透镜的设计、离子轨迹的SIMION仿真计算,最后通过实验调试实现了整体设计,并测试了整套设计的总体指标。结果表明,样机比原仪器的丰度灵敏度指标提高约330倍,样机最后一级的传输率约为9%,与仿真计算结果相符。更多还原

【Abstract】 Ion optics is a critical aspect in the designing of a mass spectrometer.For improving the abundance sensitivity,a new magnetic-electric-quadrupole(MEQ)tandem mass spectrometer was designed and manufactured.In this MEQ tandem mass spectrometer,the lens in the last stage is quite different from that of normal double focus mass spectrometers or quadrupole mass spectrometers.In this paper,the ion optics design of the instrument is presented,together with detailed design of the lens neighboring the quadrupole,the numerical calculating result of the ion trajectory in these lenses and the quadrupole with the help of SIMION 7.0 software.The transferring efficiency for the last stage is evaluated,and tested to be around 9% in experiment,which is in accordance with the calculated result.更多还原