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    • 10. 发明授权
    • Mass spectrometer
    • 质谱仪
    • US06770872B2
    • 2004-08-03
    • US10301580
    • 2002-11-22
    • Robert Harold BatemanJeff BrownAnthony James Gilbert
    • Robert Harold BatemanJeff BrownAnthony James Gilbert
    • H01J4934
    • H01J49/004H01J49/401H01J49/42
    • A mass spectrometer is disclosed comprising a mass selective ion trap such as a 3D quadrupole field ion trap upstream of a pusher electrode of an orthogonal acceleration Time of Flight mass analyser. According to a first embodiment bunches of ions are released from the ion trap and the pusher electrode is energized after a delay time which is progressively varied. According to a second embodiment ions are released from the ion trap in reverse order of mass to charge ratio with the ions having the largest mass to charge ratio being released first. By appropriate release of the ions from the ion trap it is possible to ensure that substantially all of the ions arrive at the pusher electrode at substantially the same time. According to both embodiments it is possible to achieve a duty cycle approaching 100% across a large range of mass to charge ratios.
    • 公开了一种质谱仪,其包括质量选择性离子阱,例如正交加速时间飞行质量分析仪的推进器电极上游的3D四极场离子阱。 根据第一实施例,一束离子从离子阱中释放出来,并且推进器电极在逐渐变化的延迟时间之后通电。 根据第二实施方案,离子从离子阱以与质荷比最大的离子的质荷比相反的顺序被释放。 通过从离子阱适当释放离子,可以确保基本上所有的离子基本上同时到达推动器电极。 根据两个实施例,可以实现在大范围的质荷比之间接近100%的占空比。