Abstract
THE focal length of a three-aperture electrostatic lens follows from the general paraxial ray equation : where Φ is the potential along the axis (r = 0), and Φ0 is the acceleration voltage.
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LE RÜTTE, W. Chromatic Aberration of Electrostatic Lenses. Nature 161, 392–393 (1948). https://doi.org/10.1038/161392a0
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DOI: https://doi.org/10.1038/161392a0
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