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Im working on a project in designing a (TOF) mass spectrometer and want to include an einzel lens in order to help focus the ion beam onto the detector.

I know the basics behind the operation of the lens, but am struggling to find any equations for the focal length of an einzel lens.

Obviously, it will be determined by the potential applied and the velocity of the ions in the beam, but I know that simply using standard equations will not work.

Does anyone out there know what Im looking for?

Thanks,

kiwi

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# Einzel Lens & focal length

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