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The asymmetry of neutron powder diffraction peaks
Author(s) -
Cooper M. J.,
Sayer J. P.
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/s002188987501148x
Subject(s) - asymmetry , neutron diffraction , optics , diffractometer , resolution (logic) , neutron , powder diffractometer , diffraction , detector , materials science , position (finance) , aperture (computer memory) , powder diffraction , computational physics , bragg peak , physics , nuclear magnetic resonance , nuclear physics , beam (structure) , computer science , scanning electron microscope , finance , artificial intelligence , acoustics , economics , quantum mechanics
Profile analysis methods used with neutron diffraction data from powder samples require a knowledge of the shape and position of individual peaks. Because of the finite aperture of the detector these peaks become increasingly asymmetric at smaller Bragg angles, becoming broadened and shifted from the true Bragg angle. These effects are considered in detail by deriving the intensity distribution resulting from the resolution function of the diffractometer and evaluating it for a number of sets of instrumental parameters. The results are compared to those calculated ignoring the asymmetry, and empirical functions are derived for the required correction factors.