RESUMO
The characteristics of spectra obtained by monochromatization of a broadband spectrum using the effect of X-ray anomalous transmission (Bormann effect) have been experimentally studied. Optimization of the crystal thickness allows one to obtain the spectral band with a controlled width of ΔE/Eâ=â1-5 10-3 and with a contrast of more than 250 with a peak reflectivity not less than 4% in the transmitted Bormann beam. It was found that due to the wave field compression, the width of the transmitted Bormann beam decreased three times as the thickness of the crystal increased. The value of parallel displacement of the transmitted Bormann beam relative to the primary one, which depends on crystal thickness, was measured. This value was shown to be sufficient for the beams to be separated by the slit. Monitoring the transmitted Bormann beam by the shape of 2d-curves of the diffracted Laue-beam enables the precise control of characteristics of the primary source with a complex shape of angle and energy distributions of photons.
