X-ray diffraction profiles in strained crystals undergoing ultrasonic excitation. The Laue case

Abstract

A new approach for the calculation of diffraction profiles in strained crystals is developed, based on the visual concepts of the dispersion surface and Poynting vectors. By this approach, analytical expressions have been obtained for diffraction profiles for the case of a constant strain gradient without, as well as with, ultrasonic excitation. Calculations of acoustically induced modifications in diffraction spectra explain in detail the anomalous dependence of integrated intensity on ultrasound amplitude, a dependence that was recently found in the Laue scattering geometry.