Ideal lenses and the Scherzer theorem: A supplement

In this article, we discuss the form of an ideal magnetic field which will be free from spherical aberration. The result is that a divergent point is needed in the magnetic field distribution, so that an ideal lens in this sense cannot be achieved. However, one may be able to approach the limit in a...

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Bibliographic Details
Published in:Ultramicroscopy 1988, Vol.26 (4), p.385-388
Main Authors: Shao, Zhifeng, Crewe, A.V.
Format: Article
Language:English
Subjects:
Charged-particle beams
Electromagnetism
electron and ion optics
Electron and positron beams
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Physics
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Summary:In this article, we discuss the form of an ideal magnetic field which will be free from spherical aberration. The result is that a divergent point is needed in the magnetic field distribution, so that an ideal lens in this sense cannot be achieved. However, one may be able to approach the limit in a practical design by approximating the ideal field.
ISSN:0304-3991
1879-2723
DOI:10.1016/0304-3991(88)90237-9