A new interpretation of reduction in absorption coefficient at and near Laue diffraction maximum in thin and perfect crystals on the basis of dynamical theory of X-ray diffraction
Abstract
By analysing in detail the existing plane wave dynamical theory of X-ray diffraction for thin (μt sec θ ∼ 0.30) and perfect crystal we demonstrate the presence of forward diffracted beam when the crystal is oriented for Laue diffraction. Recently, these features have been demonstrated experimentally by Lal et al. (Solid State Comm. 81 (1992) 461–465 & 96 (1995) 33–36) in the case of diamond crystals. We also show that a residual direct beam is implicitly built in the expression for forward diffracted beam intensity. It has been shown that there is a substantial decrease in absorption coefficient, μ, of thin perfect crystals for exploring X-ray beam around Laue diffraction maximum. The computed fractional change in μ, Δμ/μ, at the [unk]20 diffraction peak of a thin (111) diamond crystal for MoKα1 exploring radiation is found to be in reasonably good agreement with the experimentally observed value (Lal et al. Acta Crystallogr. A52 (1996) C-493). The results reported here are of general nature and applicable to all crystals.
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- X-ray diffraction study of poly crystalline Y2BaO4: a test of the new EXPO program
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- Electron crystallography of the polymethylene chain. 1. The crystal structure of n-tritriacontane in the B-polymorph1
- Electron crystallography of the polymethylene chain. 2. The lamellar interface of n-paraffin solid solutions1
- Crystal structures of two 4-bromopyrazole derivatives
- The crystal and molecular structures of some nickel(ll)bis(O-alkyldithiocarbonate)s and nickel(II)bis(N,N-dialkyldithiocarbamate)s: an evaluation of the coordination potential of 1,1-dithiolate ligands in their nickel(II) complexes
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