Figure 3
Calculated diffuse-scattering patterns (upper semicircles) for PCNB compared with the corresponding observed X-ray data (lower semicircles). (a)
0kl section. (b)
hk0 section. (Note the upper and lower halves are not related by
m symmetry.
0kl has twofold symmetry;
hk0 has sixfold symmetry. It should also be noted that the calculated patterns contain no actual Bragg peaks since the average structure is subtracted during the calculation.) |