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\begin{document}
\newpage
\section*{Elektronenbeugungsr\"{o}hre}
Der experimentelle Nachweis der Elektronenbeugung an Kristallen gelang 1927 C. J. Davisson (1881 -- 1958) und L. H. Germer (1886 -- 1971)
Louis De Broglie (1892 -- 1987) hatte 1923 als Hypothese formuliert, dass sich Materie mit Elementen der Wellentheorie beschreiben lassen sollte und aus theoretischen \"{U}berlegungen f\"{u}r die Wellenl\"{a}nge (nach ihm als de-Broglie-Wellenl\"{a}nge bezeichnet) $\lambda = \frac{h}{m\cdot v} = \frac{h}{p}$ hergeleitet. 1961 wurde das Doppelspaltexperiment mit Elektronen durch Claus J\"{o}nsson (1931 -- ) an k\"{u}nstlich hergestellten Feinspalten durchgef\"{u}hrt.
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\section*{Netzebenen im Graphit}
Der Winkel des einfallenden Strahles wird nicht, wie in der Optik \"{u}blich, gegen das Lot, sondern gegen die Netzebene gemessen. Der einfallende Strahl wird durch die Reflexion an den Netzebenen um den doppelten Winkel abgelenkt.
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