1,330
edits
Centric and acentric reflections: Difference between revisions
m
→Reciprocal space
mNo edit summary |
|||
| Line 25: | Line 25: | ||
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 | ||
(<math> P(|E|) = 2 |E| e^{-|E|^2} </math>) are different from those of acentric reflections | (<math> P(|E|) = 2 |E| e^{-|E|^2} </math> ) are different from those of acentric reflections | ||
(<math> P(|E|) = \sqrt{\frac{2}{\pi}} e^{-|E|^2/2} </math>) (would be nice to have little plots here). | (<math> P(|E|) = \sqrt{\frac{2}{\pi}} e^{-|E|^2/2} </math> ) (would be nice to have little plots here). | ||
Centric reflections have a special role in [[ | Centric reflections have a special role in experimental [[phasing]]. | ||
There exist space groups without centric reflections, like R3. | There exist space groups without centric reflections, like R3. | ||
== References == | == References == | ||