Difference between revisions of "Serial reflection conditions"
From Online Dictionary of Crystallography
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| − | <Font color="blue"> Conditions de réflexion sériales </Font> (''Fr''). <Font color="black"> Condizioni di riflessione seriali </Font>(''It'') | + | <Font color="blue"> Conditions de réflexion sériales </Font> (''Fr''). <Font color="black"> Condizioni di riflessione seriali </Font>(''It''). |
== Definition == | == Definition == | ||
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<table border cellspacing=0 cellpadding=5 align=center> | <table border cellspacing=0 cellpadding=5 align=center> | ||
<tr> | <tr> | ||
| − | <th> | + | <th>Type of reflection</th><th>Reflection condition</th> <th>Screw vector</th><th>Screw axis</th> </tr> |
<tr> <td rowspan=2>00''l''</td> <td>''l'' = 2 ''n''</td> <td>'''c'''/2</td><td> 2<sub>1</sub>; 4<sub>2</sub></td></tr> | <tr> <td rowspan=2>00''l''</td> <td>''l'' = 2 ''n''</td> <td>'''c'''/2</td><td> 2<sub>1</sub>; 4<sub>2</sub></td></tr> | ||
<tr> | <tr> | ||
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</table> | </table> | ||
| − | The serial reflection conditions are listed in Table 2. | + | The serial reflection conditions are listed in Table 2.1.3.7 of ''International Tables for Crystallography, Volume A'', 6th edition. |
==See also == | ==See also == | ||
| − | *[[ | + | *[[Reflection conditions]] |
| − | *Section 2.1.3.3 of ''International Tables | + | *Section 2.1.3.3 of ''International Tables for Crystallography, Volume A'', 6th edition |
| − | [[Category:X-rays]] | + | [[Category:X-rays]] |
Revision as of 10:40, 17 May 2017
Conditions de réflexion sériales (Fr). Condizioni di riflessione seriali (It).
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
- Section 2.1.3.3 of International Tables for Crystallography, Volume A, 6th edition