垂直焦面质谱计的离子光学

Ion Optics for Mass Spectrometers with Normal Focal Planes

  • 摘要: 推导了质谱计焦面几何形状及焦面与光轴夹角的表达式。讨论了修正(x/θδ)二级色差,获得垂直焦面的途径:引进六极透镜;把两极磁铁出口边界面修成园弧面;对两极磁铁的磁场进行垫补,使其包含六极分量。给出了消除二级角象差的垂直焦面质谱计的方案实例。

     

    Abstract: The expressions for the focal plane geometry and the angle included be-tween the focal plane and the optical axis of a mass spectrometer are derived.The methods to correct second order chromatic aberration coefficient (x/θδ)and obtain a normal focal plane are discussed, they are adding a sextupole,machining a concave boundary at the exit of the sector magnet and shimmingthe magnetic field of the dipole magnet to have sextupole component. Someprojects of mass spectrometers with normal focal planes and second order an-gular aberration corrections are given.

     

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