# Zonal reflection conditions

(Difference between revisions)
 Revision as of 07:21, 5 May 2006 (view source)← Older edit Revision as of 07:26, 5 May 2006 (view source)Newer edit → Line 3: Line 3: == Definition == == Definition == - The zonal reflection conditions are the general [[reflection conditions]] due to the presence of glide planes. + The zonal reflection conditions are the general [[reflection conditions]] due to the presence of glide planes. The resulting conditions apply only to twodimensional 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 reflectionreflection 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''. ==See also == ==See also ==

## Revision as of 07:26, 5 May 2006

Conditions de réflexion zonales (Fr).

## Definition

The zonal reflection conditions are the general reflection conditions due to the presence of glide planes. The resulting conditions apply only to twodimensional 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 reflectionreflection condition glide vector glide plane
0kl k = 2 n b/2 b
l = 2 nc/2 c
k + l = 2 nb/2 + c/2 n
k + l = 4 n
k, l = 2n
b/4 ± c/4 d

The zonal reflection conditions are listed in Table 2.2.13.2 of International Tables of Crystallography, Volume A.