Surface acoustic waves are investigated by stroboscopic topography using synchrotron radiation from the storage ring DORIS. The observed contrast of the acoustic displacements of the lattice planes has the same periods as the acoustic wave. It is demonstrated that the major part of the contrast is due to orientation contrast of the curved net planes. Intensity maxima correspond to troughs of the acoustic wave, minima to crests. A numerical treatment yielding ray tracing maps, intensity curves as well as focusing conditions which are in quantitative agreement with the experimental data are presented.
After briefly describing the concept of short X-ray pulses (delta-function), the diffraction of such a short pulse by a crystal in the asymmetric Laue case is given. The results of the dynamical theory are adopted and an analytic result for the intensity distribution behind the crystal in the diffracted direction as well as in the forward direction is given and discussed in detail. The incoming delta pulse is no longer infinitely short but shows a pronounced structure over a limited temporal or spatial region which is connected to the well known Pendellösung effect. Also the limitations of these findings are critically inspected.
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