By R. Brill and R. Mason (Eds.)

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Additional resources for Advances in Structure Research by Diffraction Methods. Fortschritte der Strukturforschung mit Beugungsmethoden

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In this field, on the one hand, relativistic effects may be handled as corrections; on the other hand, the convergence of the dynamical approximations is relatively good. Dynamical theory of electron diffraction 55 The cases of "RHEED" (= Reflection High-Energy Electron Diffraction; that is, the case of grazing incidence) and "LEED" (= Low-Energy Electron Diffraction) and also the relativistic implications at very high energies have to be further developed theoretically and cannot be treated in detail in this article.

Separated experimentally. We shall therefore speak of double refraction only. This effect would be impossible to observe if a real plane wave existed since it would have an infinite lateral extension. It would also be impossible to observe with an ordinary setting since, as we have seen, the whole dispersion surface is then excited. It is therefore necessary to have a narrow beam which will excite a small portion only of the dispersion surface, in other words, a beam which is also narrow in reciprocal space.

Every experimental effect which cannot be described by this simple theory is called "dynamical". For nearly ideal crystals the dynamical X-ray effects are of considerable interest [2], especially in connection with anomalous absorption (Borrmann effect). In electron diffraction dynamical effects are discussed mainly for the following practical purposes: ) Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin-Dahlem 54 K. Kambe / K. Moliere (i) In "conventional" structure analysis (i. e. evaluation of structure factors from measured integral intensities, e.

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