Image Modes in TEM - Dark Field Images

TEM |Image Formation | Bright Field Images | Lattice Images (HRTEM)

In dark field (DF) images, the direct beam is blocked by the aperture while one or more diffracted beams are allowed to pass the objective aperture. Since diffracted beams have strongly interacted with the specimen, very useful information is present in DF images, e.g., about planar defects, stacking faults or particle size.

Example