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Astigmatism Effect on Fourier Transform
- Practical Electron Microscopy and Database -
- An Online Book -
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https://www.globalsino.com/EM/
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This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
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Astigmatism is a non-azimuthally-symmetric lens aberration. It can be described by adding an azimuth dependent term to the phase shift function. This term is given by, [page4236]
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The anisotropy of the astigmatism has the effect of averaging-out the higher frequency extrema in the radially averaged Fourier spectrum and thus depresses the high-frequency radial Fourier spectrum.
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