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Mikula, Pavol,Vrá,na, Miroslav,Š,aroun, Jan,Davydov, Vadim,Em, Vyacheslav,Seong, Baek‐,Seok International Union of Crystallography 2012 Journal of applied crystallography Vol.45 No.1
<P>Multiple Bragg reflections (MBRs), which can be realized in a bent perfect crystal (BPC) slab and are mutually in dispersive diffraction geometry, provide a monochromatic beam of excellent resolution. After identifying many MBR effects in a BPC Si crystal by using the method of θ–2θ<SUB>D</SUB> scanning, we have turned our attention to the study of selected effects using the method of azimuthal rotation of the crystal lattice around the scattering vector of the primary reflection for a fixed chosen wavelength. In this paper, several azimuthal scans with the intention of possible practical exploitation for very high resolution diffractometry are presented.</P>
Double Bent Crystal Monochromator for High Resolution Neutron Powder Diffraction
Mikula, P.,Vrá,na, M.,Š,aroun, J.,Seong, B.S.,Woo, W. Cambridge University Press 2013 POWDER DIFFRACTION Vol.28 No.2
<P>Recent results of focusing and reflectivity properties of the dispersive double-bent-crystal monochromator have shown that it could be succesfully used in high resolution neutron diffraction experiment. By using a standard polycrystalline sample of α-Fe, the resolution of the diffraction performance in the vicinity of the scattering angle 2<I>θ</I>S = 90<SUP>o</SUP> for the neutron wavelength <I>λ</I>= 0.162 nm was tested in detail. It has been found that for thin (1.3 mm) bent second crystal the angular resolution represented by <I>FWHM</I> of diffraction profiles was 1x10<SUP>−3</SUP> rad for 211 and 200 reflections and about 3x10<SUP>−3</SUP> rad for 220 reflection.</P>