The Fine Structure of Spots in Electron Diffraction Resulting from the Presence of Planar Interfaces and Dislocations. V. Observations on Coherent Domain Boundaries

Observations of the fine structure of electron diffraction spots due to the presence of coherent domain boundaries in ordered Ni₄Mo are compared with theoretical results derived in part III of this paper. It is shown that the predicted fine structure consisting of satellites lying in a direction perpendicular to the image fringes can be observed. How‐ever, in general, only one or two out of the four predicted satellites are registered, the intensity of the other ones being too small. Analysis is made of the fine structure and excellent agreement between theory and experiment is found. Identification of the satellites, based among others on intensity considerations is possible and illustrated on an example. Moreover, the orientation parameters such as s, Δs, and the extinction distance can be estimated from the geometry and a method is outlined allowing to calculate the absorption length from the measured intensities of the satellites.