Abstract
The relation between the Bloch waves and the anomalous transmission in the high energy electron diffraction is studied and it is shown that the Bloch waves of electrons bound loosely by crystal potential mainly contribute to the diffraction contrast in the Kikuchi patterns and electron micrographs. An experiment is carried out to observe the bend contours of thin gold, tungsten and molybdenum crystals by a high voltage electron microscope and it is found that the position of the anomalous transmission changes from the symmetry position to the first Bragg one at the energies corresponding to the same value of an interaction parameter which is correlated with the number of the bound state of the incident electron in the planar potential.
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