Figure 1
Beam trajectories in a weakly bent crystal and schematic illustrations of interference between the beams. (a) Interference of a mirage diffraction beam (dashed curve with the corresponding refracted beam S1) with another mirage diffraction beam (solid curve with the corresponding refracted beam S2) to produce IFMD in a weakly bent part of the crystal. (b) Interference of a mirage diffraction beam (solid curve with the corresponding refracted beam S3) with a reflected beam from the bottom surface (dashed curves with the corresponding refracted beam S4) to produce IFMRB in a more weakly bent part. h is the reciprocal lattice vector and u the atomic displacement vector, and [alpha]1, [alpha]2, [alpha]3 and [alpha]4 are the glancing angles of the incident beam corresponding to the refracted beams S1, S2, S3 and S4, respectively.  [article HTML]