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公开(公告)号：US4814613A
公开(公告)日：1989-03-21
申请号：US22647
申请日：1987-03-06
申请人： Wade L. Fite , Suhas N. Ketkar
发明人： Wade L. Fite , Suhas N. Ketkar
CPC分类号： H01J49/005 , H01J49/067 , H01J49/421
摘要： Methods and apparatus for improving the performance of triple quadrupole tandem mass spectrometers consisting of constructing the collision cell surrounding the second quadrupole structure, into which collision gas is admitted, with end plates composed of leaky dielectric material which appear to radio-frequency electric fields as a dielectric and to dc electric fields as a conductor. The result is that the rf fringe fields extend farther away from the ends of the poles of the first and third analyzing quadrupole mass filter than do the dc fringe fields, thus keeping the ions on stable trajectories in the regions between the analyzing quadrupoles and the end plates of the collision cell, and improving the transmission of ions. The effect is enhanced by applying the same frequency and phase of the ac voltages applied to all three quadrupole structures.
摘要翻译： 用于提高三重四极串联质谱仪性能的方法和装置，包括构成碰撞气体的第二四极结构周围的碰撞气室，其中由作为射频电场的泄漏介电材料构成的端板由作为 电介质和直流电场作为导体。 结果是，与直流条纹场相比，射频边缘场距离第一和第三分析四极杆质量过滤器的极点的端部更远，从而将离子保持在分析四极杆和末端之间的区域中的稳定轨迹上 碰撞池的板，并改善离子的透过率。 通过施加施加到所有三个四极结构的交流电压的相同频率和相位来增强效果。
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2.发明授权Method of separating and detecting impurities using a fractional concentration detector 失效使用分数浓度检测器分离和检测杂质的方法
公开(公告)号：US5360467A
公开(公告)日：1994-11-01
申请号：US101604
申请日：1993-08-03
CPC分类号： G01N33/0014 , G01N30/00 , G01N30/14 , G01N2030/025 , G01N2030/062 , G01N2030/143 , G01N2030/146
摘要： A method for detection of impurities at very low levels in hydrogen, oxygen or specialty gases comprises the metered mixture with high purity helium and subsequent selective separation of hydrogen, oxygen or specialty gas with the detection of impurities remaining in the helium by ionization spectrometry.
摘要翻译： 在氢气，氧气或特殊气体中检测非常低水平的杂质的方法包括具有高纯度氦的计量混合物，随后通过电离光谱法检测氦气中残留的杂质，选择性分离氢气，氧气或特殊气体。
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