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

International Tables for Crystallography (2010). Vol. B, ch. 2.5, p. 345   | 1 | 2 |

Figure 2.5.3.15 

M. Tanakaf
[Figure 2.5.3.15]
Figure 2.5.3.15

CBED patterns of rutile. The procedures for identifying the symmetry are also shown. (a) [001] incidence at 80 kV: the projection (proj.) WP shows symmetry 4mm. (b, c) [101] incidence at 100 kV: the projection BP and projection WP show symmetry 2mm and the WP shows symmetry m (the point group is 4/mmm). (d) Spot diffraction pattern showing no extinction caused by the lattice type (lattice type P). (e) Near-[110] incidence at 100 kV to excite exactly the 001 reflection: no extinction lines in the 001 disc (space group P42/mnm).