Abstract
The widths of the diffraction rings formed by transmitted electrons are examined from the point of view of Bethe's theory. It is shown that these angular widths are much less than the range of angle of incidence giving strong reflection, an exception occurring in the Bragg case, where the beam enters and leaves by the same crystal face. This explains most of the discrepancy found by Trillat and Hautot between the theoretical and observed widths of diffraction rings.
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