Magnetic Polepieces
- Practical Electron Microscopy and Database -
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Magnetic lenses with short focal lengths are obtained by concentrating the magnetic field by means of magnetic polepieces.

Glaser’s famous bell-shaped model suggested that in order to attain the minimum focal length and the minimum aberrations of a magnetic lens used in a TEM the specimen should be put at the middle of the gap of a pair of symmetrical polepieces [1], e.g. called objective polepiece.


[1] Cosslett, V. E. 1991. Fifty years of instrumental development of the electron microscope, in Advances in Optical and Electron Microscopy, Barer, R. and Cosslett, V. E. Eds., Academic Press, London, 215–267.




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