Fluorescence Accompanying X-Ray Diffraction in the Grazing incidence Bragg-Laue Geometry

The specific features of the fluorescence radiation yield under the conditions of X-ray diffraction in the grazing incident Bragg-Laue geometry is studied in detail. In the case of asymmetric Bragg diffraction, the experimental curves of the fluorescence yield show two independent anomalies explained by the extinction effect and the character of the wave-field formation in a crystal. Formulae of the fluorescence yield are derived for the Bragg and Laue geometries and also for the region of the Bragg-Laue transition. The behaviour of the curves depending on the asymmetry factor β is considered over a wide range of its values. The formation of diffraction and fluorescence curves are studied as a function of specular reflection. The obtained experimental results show good agreement with the theoretical calculations.