Abstract
It is discussed how, fifty years ago, new developments such as the Kossel effect and the Kikuchi patterns led to the idea of convergent beam electron diffraction experiments at the Technical University of Danzig. The construction and mode of operation of the experimental set-up designed to produce a convergent electron beam are described in some detail. Early diffraction patterns taken in 1937 demonstrate how a deeper understanding of the elementary interactions between fast electrons and a monocrystal and the resulting fine details of the interference phenomena including their interpretation in terms of the dynamic theory of electron diffraction could be obtained than previously from Kikuchi patterns. In 1940, the electron probe diameter could be reduced to 1 μm, and in 1944 the beam voltage was increased to 750 kV.
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