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
>
> gpg --keyserver pgp.mit.edu --recv-keys 67BA8D5D
>
> 8AE2 F2F4 90F7 9640 28BC 686F 78FD 6669 67BA 8D5D
>
>
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