and its directionality.

Diffraction contrast imaging

Diffraction contrast uses the variation in either or both the direction of diffracted electrons or their amplitude as a function of position as the contrast mechanism. It is one of the simplest ways to image in a transmission electron microscope, and widely used.

The idea is to use an objective aperture below the sample and select only one or a range of different diffracted directions, then use these to form an image. When the aperture includes the incident beam direction

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