1,330
edits
Centric and acentric reflections: Difference between revisions
m
→Reciprocal space
m (→Real space) |
|||
| Line 22: | Line 22: | ||
To find centric reflections, we just solve the Eigenvalue problem A v = v, now considering each reciprocal space symmetry operator in turn. | To find centric reflections, we just solve the Eigenvalue problem A v = v, now considering each reciprocal space symmetry operator in turn. | ||
Centric reflections in space group P2 and | Centric reflections in space group P2 and P2<sub>1</sub> are thus those with 0,k,0. There exist space groups without centric reflections, like R3. | ||
Properties: centric reflections have only two phase possibilities, e.g. 0° and 180° (but in any case 180° apart), and centric reflections do not have an anomalous signal (can these properties be easily derived here?). Furthermore, the "intensity statistics" of centric reflections | Properties: centric reflections have only two phase possibilities, e.g. 0° and 180° (but in any case 180° apart), and centric reflections do not have an anomalous signal (can these properties be easily derived here?). Furthermore, the "intensity statistics" of centric reflections | ||
| Line 29: | Line 29: | ||
Centric reflections have a special role in experimental [[phasing]]. | Centric reflections have a special role in experimental [[phasing]]. | ||
== References == | == References == | ||