Abstract
Multiple interference fringes have been observed in electron micrographs of wedge-shaped single crystals of poly-L-proline II. The interference fringes which occur when strong Bragg reflection is possible have been observed to split into two components as a result of secondary electron scattering and double refraction within the crystals. The separation of the fringe components is a function of the deviation of the incident electron beam from the exact Bragg condition for the reflection. The fringe contours are qualitatively interpreted using the dynamical theory of electron scattering.
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