OPTICS AND NUCLEAR PHYSICS

On dynamical X-ray diffraction in crystals modulated by an acoustic wave

V. I. Punegov

Institute of Physics and Mathematics, Komi Scientific Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia

Abstract: Dynamical X ray scattering in crystals modulated by an acoustic wave has been consistently considered. Diffraction in the cases of a spatially uniform amplitude of ultrasound in the crystal bulk and a surface Rayleigh wave has been investigated. It has been shown that the diffraction order profiles for a homogeneous acoustic wave correspond to the traditional Bragg peaks. The splitting of different diffraction maxima for large amplitudes of the surface acoustic wave has been observed. This splitting is caused by the X ray interference that is due to variations of elastic strains from the surface to the bulk of the crystal.

Received: 02.04.2019
Revised: 02.04.2019
Accepted: 16.04.2019

DOI: 10.1134/S0370274X19100023

 English version: Journal of Experimental and Theoretical Physics Letters, 2019, 109:10, 628–633

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