Dark-field imaging mode:

This is also formed by magnifying a single-beam. But this time, one of the diffracted beams is chosen by means of suitable aperture that blocks the central beam and the other diffracted beams as shown in Figure 14.03.

Figure 14.03: Schematic ray diagram of drak-field imaging mode.

This method is quite useful to study the orientation of the particles in a particular direction (hkl plane), as shown in the next slide.