Figure 17
Propagation of wavefields in a crystal. Left: reciprocal space. [{\bf s_o}]: normal to the crystal surface; P1, P2: tiepoints of the two waves excited in the crystal; [{\bf S_1}], [{\bf S_2}]: Poynting vectors. Right: Borrmann fan in direct space. After Borrmann (1959aBB25).  [article HTML]