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X‐Ray Topography of Perfect Crystals using the Laue‐Laue Three‐Beam Case of Diffraction
Author(s) -
Heyroth F.,
Eisenschmidt C.,
Höche H.R.
Publication year - 1998
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/(sici)1521-4079(1998)33:4<547::aid-crat547>3.0.co;2-m
Subject(s) - diffraction , optics , beam (structure) , collimated light , beam divergence , m squared , reflection (computer programming) , intensity (physics) , x ray crystallography , physics , beam diameter , materials science , laser beams , laser , computer science , programming language
A new kind of experiments is possible using very good collimated X‐rays with a divergence of the incident beam smaller than the diffraction curve (rocking curve) of perfect crystals. Some examples are shown for the three‐beam case of diffraction where both reflections are in Lauegeometry. The modification of the structure factor of a two‐beam case reflection in the neighbourhood of a three‐beam case causes a modification in the intensity distribution inside the Borrmann fan, which can be seen in section topographs. The energy flow in the three‐beam case can be made visible in experiments with a very narrow incident beam with a 30 × 30 μm 2 cross‐section.