1,330
edits
Centric and acentric reflections: Difference between revisions
Jump to navigation
Jump to search
m
change "number of pi" to "multiple of pi"
No edit summary |
m (change "number of pi" to "multiple of pi") |
||
| Line 9: | Line 9: | ||
For example all reflection in the zone (h,k,0) are centrics in all space groups with twofold axes down c. | For example all reflection in the zone (h,k,0) are centrics in all space groups with twofold axes down c. | ||
Theorem: '''The phase of a centric reflection is restricted to phi(h,k,l)=pi*(h*tx_g+k*ty_g+l*tz_g) plus or minus any integer | Theorem: '''The phase of a centric reflection is restricted to phi(h,k,l)=pi*(h*tx_g+k*ty_g+l*tz_g) plus or minus any integer multiple of pi''' | ||
where the vector t_g=(tx_g,ty_g,tz_g) is the translational part of the symop g that causes the reflection to be centric. | where the vector t_g=(tx_g,ty_g,tz_g) is the translational part of the symop g that causes the reflection to be centric. | ||