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Frequency analysis for modulation‐enhanced powder diffraction
Author(s) -
Chernyshov Dmitry,
Dyadkin Vadim,
van Beek Wouter,
Urakawa Atsushi
Publication year - 2016
Publication title -
acta crystallographica section a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.742
H-Index - 83
ISSN - 2053-2733
DOI - 10.1107/s2053273316008378
Subject(s) - diffraction , materials science , nonlinear system , modulation (music) , optics , powder diffraction , perturbation (astronomy) , intensity (physics) , frequency modulation , molecular physics , physics , crystallography , chemistry , acoustics , telecommunications , computer science , bandwidth (computing) , quantum mechanics
Periodic modulation of external conditions on a crystalline sample with a consequent analysis of periodic diffraction response has been recently proposed as a tool to enhance experimental sensitivity for minor structural changes. Here the intensity distributions for both a linear and nonlinear structural response induced by a symmetric and periodic stimulus are analysed. The analysis is further extended for powder diffraction when an external perturbation changes not only the intensity of Bragg lines but also their positions. The derived results should serve as a basis for a quantitative modelling of modulation‐enhanced diffraction data measured in real conditions.