Fourier Transform & Phase of Fourier Components in HRTEM Images
- Practical Electron Microscopy and Database -
- An Online Book -  


This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.



Fourier transform plays an important role in HRTEM imaging and analysis.

The phases of the Fourier components of the HRTEM (high-resolution TEM) images are determined by two ways:

          i) The Fourier components at sinχ(u) > 0 have the same phases as the phases of structure factors. This raises the same contrast in the image as the projected potential.

          ii) The Fourier components at sinχ(u) < 0 have a phase change of 180°. This raises a reversed contrast in the image.

In general, the HRTEM images are usually formed by the combination of those two Fourier components above.




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