Abstract
Electron diffraction intensities are not simply related to the corresponding structure factors except in the case of `dynamical extinctions'. These extinctions, explained by Gjonnes & Moodie [Acta Cryst. (1965), 19, 65–67], occur for reflections that are kinematically forbidden – thus the resulting intensity is zero. If it was possible to find conditions when `dynamical extinction' occurs for reflections that are not forbidden, it would be possible to use electron diffraction intensities for the determination of structure factors in a simple way. Unfortunately, it can be shown that this is not possible.
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