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Dynamical theory for calculations of X‐ray spectra from crystals modulated by surface acoustic waves
Author(s) -
Schelokov Igor A.,
Roshchupkin Dmitry V.,
Irzhak Dmitry V.,
Tucoulou Remi
Publication year - 2004
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/s0021889803023847
Subject(s) - diffraction , crystal (programming language) , surface acoustic wave , spectral line , amplitude , rayleigh wave , lattice (music) , acoustic wave , surface (topology) , rayleigh scattering , optics , physics , x ray , materials science , diffraction topography , computational physics , condensed matter physics , surface wave , x ray crystallography , acoustics , geometry , quantum mechanics , mathematics , computer science , programming language
The dynamical theory was used to model X‐ray diffraction by the YZ‐cut of an LiNbO 3 crystal modulated by surface acoustic waves (SAWs). It includes both the calculation of the crystal lattice deformation, induced by a surface wave of Rayleigh type, and the simulation of X‐ray wavefields in the crystal based on Takagi–Taupin equations. A detailed discussion is included on the effect of peak splitting occurring at high acoustic amplitudes. The developed theory entirely describes this effect and proves to be a powerful tool for understanding X‐ray diffractometry and topography measurements by SAW‐modulated crystals.
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