On Thursday, July 25, 2019 11:23:34 AM PDT Keller, Jacob wrote:
> Dear Crystallographers,
>
> It seems to be a usual assumption that anomalous scattering is essentially
> angularly-independent, e.g.:
>
> http://pd.chem.ucl.ac.uk/pdnn/diff1/anomscat.htm
>
> But why the can't we see anomalous-only spots at e.g. 1 Ang resolution in a 2
> Ang data set?
Because the resolution limit of visible data is detemined by the ordering
of the sample crystal, not by the angular dependence of the scattering factor.
A crystal that only produces spots to 4Å does so because it's a lousy crystal,
not because it somehow tricked the constituent atoms into having different
scattering factors.
Ethan
>
> This actually has some repercussions for a non-x-ray (but still resonance)
> idea, so it would be helpful to know...
>
> All the best,
>
> Jacob
>
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> Jacob Pearson Keller
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--
Ethan A Merritt
Biomolecular Structure Center, K-428 Health Sciences Bldg
MS 357742, University of Washington, Seattle 98195-7742
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