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A description is given of the Borrmann effect associated with a 3- and 4-beam interaction, as observed in the zero beam distribution of a Kossel-Möllenstedt electron diffraction pattern. In the 3-beam interaction which is studied in detail, the contribution to the intensity asymmetry is characterised by the order of the Born process. Considering the inversion symmetry about the central intersection, even order terms contribute an absorption effect, independent of the phase of the structure amplitude, while odd order terms contribute a structure dependen term which to the first order is independent of absorption. Considering the asymmetry across the weak line and parallel to the strong line, the absorption contributes an asymmetry which inverts with the sign of the structure amplitude. This latter property of the Borrmann effect has possible applications in structure analysis.

The Borrmann Effect in Few-beam Electron Diffraction Patterns:: Use of the Born Series to Analyse Diffraction Asymmetries