Polarization of Mo Kα -radiation of the bragg diffraction in real silicon crystals

The results are given for the experimental investigation of the polarization ratio (ϱ∥/ϱ⊥) and the integrated intensity (ϱ⊥) for the Bragg reflections 111, 333, 444 of silicon crystals with different dislocations density (Nd). The measured polarization ratio as a function of Nd and ϱ⊥ is found to have a maximum which is greater than that for the perfect crystal. Attention is drawn to the fact that the polarization ratio maximum for the reflection 111 exceeds unity. The obtained results are analyzed in terms of the mosaic model taking into account the primary extinction for a finite mosaic block and the secondary one between the blocks. The approximation of the mosaic model does not appear to account for the observed polarization ratio maximum. Russian Text Ignored.