Zonal reflection conditions

Conditions de réflexion zonales (Fr). Condizioni di riflessione zonali (It).

Definition

The zonal reflection conditions are the general reflection conditions due to the presence of glide planes. The resulting conditions apply only to two-dimensional sets of reflections, i.e. to reciprocal-lattice nets containing the origin (such as hk0, h0l, 0kl, hhl). For instance, for a glide plane parallel to (001):

Type of reflection	Reflection condition	Glide vector	Glide plane
0kl	k = 2 n	b/2	b
	l = 2 n	c/2	c
	k + l = 2 n	b/2 + c/2	n
	k + l = 4 n k, l = 2n	b/4 ± c/4	d

The zonal reflection conditions are listed in Table 2.1.3.7 of International Tables for Crystallography, Volume A, 6th edition.

See also

• Reflection conditions
• Chapter 2.1.3.13 of International Tables for Crystallography, Volume A, 6th edition