Figure 3
(hk0) plane of TDP at 180 K. The superstructure reflections with h = 2n + 1 are much weaker than those that still preserve a high orthorhombic pseudosymmetry. The strong pseudosymmetry showed by the heavy atoms (see text) provokes the appearance of (pseudo)systematic absences. For example, in several reciprocal rows parallel to btric* one reflection out of four is absent. |