Dynamical diffraction in highly asymmetric coplanar and non-coplanar geometries
The first part of this chapter is devoted to the derivation of the generalized dispersion equation in highly asymmetric coplanar geometries (grazing incidence or grazing emergence). The deviation from Bragg's angle of the middle of the reflection domain and the Darwin width are calculated and the generalized equation of the dispersion surface is given. The specularly and Bragg reflected intensities are then derived. The case of non-coplanar geometries is considered in the last section of the chapter and a three-dimensional representation of the dispersion surface introduced. The chapter shows how the tiepoints are obtained and the expressions of the reflected amplitudes are given.
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