Serial reflection conditions
From Online Dictionary of Crystallography
Revision as of 08:43, 20 November 2017 by BrianMcMahon (talk | contribs) (Tidied translations and added German and Spanish (U. Mueller))
Revision as of 08:43, 20 November 2017 by BrianMcMahon (talk | contribs) (Tidied translations and added German and Spanish (U. Mueller))
Conditions de réflexion sériales (Fr). Serielle Auslöschungen (Ge). Condizioni di riflessione seriali (It). Ausencias seriales (Sp).
Definition
The serial reflection conditions are the general reflection conditions due to the presence of screw axes. The resulting conditions apply only to one-dimensional sets of reflections, i.e. reciprocal-lattice rows containing the origin (such as h00, 0k0, 00l). For instance, for a screw axis parallel to [001], the reflection conditions are:
| Type of reflection | Reflection condition | Screw vector | Screw axis |
|---|---|---|---|
| 00l | l = 2 n | c/2 | 21; 42 |
| l = 4 n | c/4 | 41; 43 | |
| 000l | l = 2 n | c/2 | 63 |
| l = 3 n | c/3 | 41; 31; 32; 62; 64 | |
| l = 6 n | c/6 | 61;65 |
The serial reflection conditions are listed in Table 2.1.3.7 of International Tables for Crystallography, Volume A, 6th edition.
See also
- Reflection conditions
- Chapter 2.1.3.3 of International Tables for Crystallography, Volume A, 6th edition