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The influence of multiple Bragg scattering in γ‐ray diffractometry
Author(s) -
Schneider J. R.
Publication year - 1975
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889875011193
Subject(s) - scattering , bragg's law , optics , collimated light , radius , x ray , crystal (programming language) , wavelength , bar (unit) , biological small angle scattering , physics , position (finance) , bragg peak , materials science , beam (structure) , small angle neutron scattering , neutron scattering , diffraction , laser , computer security , finance , meteorology , computer science , economics , programming language
The occurrence of multiple Bragg scattering in a copper single‐crystal was investigated using a well collimated γ‐ray beam of wavelength 0.03 Å. The radius of the corresponding Ewald sphere is 2π/λ = 208 Å −1 . With 20 in reflecting position multiple scattering can be avoided in principle by rotating the sample about 5° around the scattering vector. There is a possibility that multiple scattering will affect the γ‐ray measurements only if the mosaic spread of the sample is larger than the smallest Bragg angle obtainable. The reflectivity of even the strongest reflections from a copper crystal of 25′ mosaic spread and thickness T = 1 cm, however, is only of the order of 5% with respect to 0.03 Åγ‐radiation and therefore the influence of multiple scattering on the shape of the measured rocking curve is negligible.