3.29: Zonal reflection conditions
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 hk 0, h 0 l , 0 kl , hhl ). For instance, for a glide plane parallel to (001):
| type of reflection | reflection condition | glide vector | glide plane |
|---|---|---|---|
| 0 kl | 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 = 2 n |
b /4 ± c /4 | d |
The zonal reflection conditions are listed in Table 2.2.13.2 of International Tables of Crystallography, Volume A .