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Borrmann effect

Due to anomalous absorption, type 1 wavefields propagate in a perfect or nearly perfect crystal with a less than normal absorption. For details and the physical interpretation, see anomalous absorption.

Super-Borrmann effect

It is the enhancement of the Borrmann effect in a three-beam case, e.g. when the 111 and {\bar 1}11  reflections are simultaneously excited in a silicon or germanium crystal.

History 

The Borrmann effect was first discovered in quartz (Borrmann G., 1941, Über Extinktionsdiagramme der Röntgenstrahlen von QuarzPhysik Z.42, 157-162) and then in calcite crystals (Borrmann G., 1950, Die Absorption von Röntgenstrahlen in Fall der Interferenz. Z. Phys.127, 297-323), and interpreted by Laue (Laue, M. von, 1949, Die Absorption der Röntgenstrahlen in Kristallen im Interferenzfall. Acta Crystallogr2, 106-113).

The super-Borrmann effect was first observed by Borrmann G. and Hartwig W. (1965), Die Absorption der Röntgenstrahlen im Dreistrahlfall der InterferenzZ. Krist.121, 401-409.

 

See also

Section 5.1 of International Tables of Crystallography, Volume B for X-rays

Section 5.2 of International Tables of Crystallography, Volume B for electrons

Section 5.3 of International Tables of Crystallography, Volume B for neutrons