I favour measuring a symmetry related reflection - it is more likely to
have different systematic error.
But if you after Friedel differences there is some argument for measurng
hkl and -h-k-l in the same orientation..
However high redundancy if you can achieve it always seems to me to give
the best overall data set - high redundancy also gives you a statistical
basis for rejecting outliers.
Eleanor
Francis E Reyes wrote:
For a given reflection (h,k,l) how much does each situation increase
the redundancy ? and which maximizes the ability to measure anomalous
differences? (so assume we're separating friedel pairs here)
a) measuring the same reflection again
b) measuring a symmetry related reflection
c) both a+b
Thanks!
FR
---------------------------------------------
Francis Reyes M.Sc.
215 UCB
University of Colorado at Boulder
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