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Probing structural chirality with high‐energy synchrotron radiation
Author(s) -
Dyadkin Vadim,
Wright Jon,
Pattison Philip,
Chernyshov Dmitry
Publication year - 2016
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/s1600576716006282
Subject(s) - synchrotron radiation , absolute zero , crystal structure , crystal (programming language) , chirality (physics) , absolute scale , crystallography , chemistry , range (aeronautics) , materials science , physics , atomic physics , optics , nuclear physics , programming language , chiral symmetry breaking , computer science , nambu–jona lasinio model , composite material , thermodynamics , quark
The absolute structure has been determined for MnSi with data collected using synchrotron radiation with E = 78.3 keV (0.158 Å). At this energy, the resonant scattering contribution from MnSi is very small ( f ′ Mn = −0.0397, f ′′ Mn = 0.0385, f ′ Si = −0.0197, f ′′ Si = 0.0027), but the large number of observed Bijvoet differences together with a wide Q range make absolute structure determination possible. A comparison with the data collected at E = 18 keV (0.68 Å) ( f ′ Mn = 0.2858, f ′′ Mn = 0.6739, f ′ Si = 0.0653, f ′′ Si = 0.0646) for the same crystal shows the correctness of the absolute structure measured at the higher energy. A similar data collection has also been done at E = 65.3 keV (0.19 Å) for a single crystal of Fe 0.7 Co 0.3 Si with known absolute structure. In all cases, the absolute structure was correctly determined by analysing the statistical distribution of the chirality measure. Statistical descriptors of the refinements, the Flack parameter and the distribution of Parsons quotients are discussed for all presented experiments.