1,330
edits
Centric and acentric reflections: Difference between revisions
Jump to navigation
Jump to search
m
no edit summary
m (→Real space) |
mNo edit summary |
||
| Line 24: | Line 24: | ||
Centric reflections in space group P2 and P2_1 are thus those with 0,k,0. | Centric reflections in space group P2 and P2_1 are thus those with 0,k,0. | ||
Properties: centric reflections have only two phase possibilities, e.g. 0° and 180° | 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|) = \sqrt{\frac{2}{\pi}} e^{-|E|^2/2} </math>) (would be nice to have little plots here). | |||
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 == | ||