Peculiarities of the formation of the X-ray diffraction image of a surface acoustic wave in grazing geometry

The x-ray diffraction image of a Bluestein-Gulyaev surface acoustic wave (SAW) at grazing angles of incidence is considered in the noncoplanar symmetric Laue geometry. It is assumed that the SAW propagation direction makes a small angle with the diffraction vector. It is shown that small deviations from the Bragg angle (～0.01″) due to SAWs that do not lead to a change in the reflection coefficient result in the formation of diffraction satellites for both standing and traveling SAWs. The recorded x-ray diffraction image representing the time-averaged intensity distribution has characteristic profiles for even-and odd-order satellites.