Abstract
Abstract Measurements by Watanabe have shown that the mean absorption coefficient for fast electrons increases with increasing deviation from the exact Bragg position. Values for the mean absorption coefficient were obtained by applying the results of the two-beam theory of electron diffraction to the intensity profiles of thickness-extinction contours in aluminum. According to this theory the mean absorption coefficient is independent of the deviation from the exact Bragg position. The purpose of this paper is to show that Watanabe's results are expected when many-beam effects are taken into account.
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