The crystallographic information in localised characteristic loss electron images and diffraction patterns

The intensity distribution of energy-filtered intermediate and large energy loss images and diffraction patterns has been calculated. It is concluded that satisfactory interpretation of experimentally obtained images and diffraction patterns can only be achieved by matching with the calculated ones and that, in favourable cases, the local projected symmetry of coordination polyhedra may be determined from the observed symmetry of characteristic loss energy-filtered diffraction patterns.