Slit smearing in SASREF and BUNCH

Interactive modelling (MASSHA, SASpy) and global minimization programs (SASREF, BUNCH, CORAL, GLOBSYMM)
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david.a.jacques
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Slit smearing in SASREF and BUNCH

#1 Post by david.a.jacques » 2010.05.28 08:50

I hear a rumor that SASREF and BUNCH are able to smear the model scattering to fit data collected on a slit geometry. Is this true, and if so how can I implement it for rigid body body refinement. It would be much nicer to not have to desmear data.

SaxsMax
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#2 Post by SaxsMax » 2010.08.30 15:24

There is a question "Use Kratky geometry?"
in latest versions of both programs. Answering Yes
will result in smearing of the computed curve.

david.a.jacques
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#3 Post by david.a.jacques » 2010.08.31 00:03

How does this work without asking for a beam profile, or some description of beam geometry?

sjc
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Re: Slit smearing in SASREF and BUNCH

#4 Post by sjc » 2017.01.30 20:06

I know I'm about 7 years late to this thread, but I can't find any documentation about how BUNCH and SASREF handle the Kratky data. Can anyone point me in the right direction?

SaxsMax
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Re: Slit smearing in SASREF and BUNCH

#5 Post by SaxsMax » 2017.02.02 13:24

The smearing is done according to the equation (9.26) from Feigin&Svergun book, page 295 with W(t)=2*Smax (i.e. constant) corresponding to an infinite slit.

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