On Thursday, October 14, 2010 02:28:26 pm Jacob Keller wrote:
> I have always found this angle independence difficult. Why, if the anomalous scattering is truly angle-independent, don't we just put the detector at 90 or 180deg and solve the HA substructure by Patterson or direct methods using the pure anomalous scattering intensities? Or why don't we see pure "anomalous spots" at really high resolution?
> I think Bart Hazes' B-factor idea is right,
Yes, certainly.
But the fall-off of intensity at higher resolution due to imperfect ordering
(modeled by a B factor) is a separate issue from have an angular dependence
of the scattering factors.
Both reduce the measured intensity, but for different reasons.
Ethan
>
> JPK
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Ethan A Merritt
Biomolecular Structure Center, K-428 Health Sciences Bldg
University of Washington, Seattle 98195-7742
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