Dear Jacob,
closely related to Ethan's explanation, but not quite the same, the
contribution of f' and f" is still affected by the fall off from the ADPs, i.e.
they also fall off exponentially, even for high quality crystals with a very
low B-factors.
The effect that you describe, however, still has to be accounted for during
refinement, which is why you have the DISP command in SHELXL.
Best,
Tim
On Thursday, July 25, 2019 8:23:34 PM CEST 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?
>
> 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
>
> +
> Jacob Pearson Keller
> Research Scientist / Looger Lab
> HHMI Janelia Research Campus
> 19700 Helix Dr, Ashburn, VA 20147
> Desk: (571)209-4000 x3159
> Cell: (301)592-7004
> +
>
> The content of this email is confidential and intended for the recipient
> specified in message only. It is strictly forbidden to share any part of
> this message with any third party, without a written consent of the sender.
> If you received this message by mistake, please reply to this message and
> follow with its deletion, so that we can ensure such a mistake does not
> occur in the future.
>
>
>
>
> To unsubscribe from the CCP4BB list, click the following link:
> https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB=1
--
--
Tim Gruene
Head of the Centre for X-ray Structure Analysis
Faculty of Chemistry
University of Vienna
Phone: +43-1-4277-70202
GPG Key ID = A46BEE1A
To unsubscribe from the CCP4BB list, click the following link:
https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB=1
signature.asc
Description: This is a digitally signed message part.
