axial coma aberration
axial coma aberration
"Axial coma aberration" is a parasitic aberration due to incomplete axial symmetry of an electromagnetic lens (objective lens). This aberration deforms a circular image of the electron source to a cone-shaped (comet-shaped) image. The axial coma aberration arises from asymmetry of the pole piece bore of the lens, magnetic non-uniformity of the pole piece material, electron charging on the aperture, etc.
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