Multiwave diffraction, phase problem, and extinction in imperfect crystals
- Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)
The extinction effects of multiwave diffraction in imperfect crystals have been investigated. It is shown that the presence of extinction in the direct diffraction channel may lead to errors in determining the relative phases of structural amplitudes by the multiwave diffraction method (i.e., by interference with indirect excitation). The reason is that the dependence of the reflection intensity on the structural amplitude in imperfect crystals is generally nonquadratic (as in the kinematic theory), nonlinear (as in the dynamic theory), and is not even somewhat intermediate. These effects open up new possibilities for using multiwave diffraction for the direct study of the extinction and, therefore, quantitatively characterize the imperfection of crystal structures with known values and phases of structural amplitudes.
- OSTI ID:
- 22051259
- Journal Information:
- Crystallography Reports, Vol. 54, Issue 6; Other Information: Copyright (c) 2009 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7745
- Country of Publication:
- United States
- Language:
- English
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