International
Tables for
Crystallography
Volume B
Reciprocal space
Edited by U. Shmueli

International Tables for Crystallography (2010). Vol. B, ch. 2.5, p. 349   | 1 | 2 |

Table 2.5.3.13 

M. Tanakaf

Table 2.5.3.13| top | pdf |
Wavevectors, point- and space-group symbols and CBED symmetries of one-dimensionally modulated crystals

Wavevector transformationPoint-group symbolSymmetry of incommensurate reflectionSpace-group symbolDynamical extinction lines
[{\bf k} \rightarrow {\bf k}] 1 Same symmetry as average structure 1, s (1/2), t (±1/3), q (±1/4), h (±1/6) Yes for s, q and h
[{\bf k} \rightarrow -{\bf k}] [\bar 1] No symmetry [\bar 1] No