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Centric and acentric reflections: Difference between revisions
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change "number of pi" to "multiple of pi"
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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. | ||