> -----Original Message-----
> From: [log in to unmask] [mailto:[log in to unmask]]
On
> Behalf Of Francis E Reyes
> Sent: 21 July 2009 22:22
> To: [log in to unmask]
> Subject: Self Rotation map in R32?
>
> Hi all
>
> I'm trying to understand why there is a peak that is perpendicular to
> the c axis on my kappa = 180 and kappa = 90?
On the kappa = 180 section they are the 3 crystallographic 2-folds perp
to the cryst 3-fold parallel to c.
On kappa = 90 a peak would be a 4-fold but since there's no obviously no
crystallographic 4-fold in R32, that would imply 4-fold NCS, which would
be unusual. You didn't post your kappa=90 section so we can't tell if
it really is a significant peak.
> The chapter entitled "Characterizing a Crystal From an Initial Native
> Dataset" from Sawaya says that R32 shouldn't have a central peak in
> kappa = 180 nor 90.
Not sure what you mean by 'central peak', the peak in the middle of the
kappa=180 section is the crystallographic 3-fold so that's unavoidable
in R32. Again any peak on kappa=90 would depend on what kind of NCS you
have. How many mols/a.u. do you estimate?
HTH!
-- Ian
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