[SasView Users] Inquiry regarding fitting the SAXS data

[Paul Butler via users]

Hi Rini,

Just to clarify your question. I assume you are saying that the “raspberry
model,” which was developed by the Pozzo group at the University of
Washington to model pickering emulsions is not suitable for your case and
you have developed your own plugin model?

Or is the question how to write a plugin model based on a model you have
developed theoretically? Or is the question that your plugin does not allow
you to multiply a structure factor with it?. Or are you wanting to write
your own structure factor plugin? If in fact that next to last is what you
are looking for, that should be pretty straightforward. Basically you will
need to define the effective radius for interactions in your plugin model
as described here:
https://www.sasview.org/docs/user/qtgui/Perspectives/Fitting/plugin.html#form-factors

If you also want to be able to include the beta approximation option you
will also need to calculate the F(Q) in your model (currently would require
a c model) and declare that Fq is available in the python part of your
model as described here:
https://www.sasview.org/docs/user/qtgui/Perspectives/Fitting/plugin.html#structure-factors

Finally, if you want to create a structure factor you just need to include
that flag (structure_factor=true) as explained here:
https://www.sasview.org/docs/user/qtgui/Perspectives/Fitting/plugin.html#model-definition

Also we now have a tutorial on writing custom models available here:
https://www.sasview.org/downloads/creating_custom_fitting_models_in_sasview_v5.pdf

Let me know if any of this helps, if you need more information, or if you
are looking for something completely different

Stay safe

Paul Butler

developer team member


On Wed, Apr 17, 2024 at 5:11 AM Rini P R via users <users at lists.sasview.org>
wrote:

> Dear SasView Team,
>
> I hope this message finds you well. My name is Rini and I am a PhD
> candidate in the Department of Physics at the Norwegian University of
> Science and Technology, Trondheim, Norway.
>
> I have a specific question and I'm not sure who to contact. We are working
> with Pickering emulsions made with food-grade materials and have
> encountered challenges in fitting the data from our recent SAXS experiment
> with the available models. We have concluded that combining a structure
> factor with our current plugin model will enable us to fit our data and
> extract the information we need.
>
> Could you please direct me to the right person or help me get in touch
> with someone who can assist us with modifying the model as described?
>
> Thank you in advance for your time and support.
>
> Best regards,
> Rini PR
>
> PhD candidate
> Institute for Energy Technology (IFE)
> Kjeller, Norway
>
> Workplace:
> Soft and Complex matter lab
> Department of Physics
> Norwegian University of Science and Technology (NTNU)
> Trondheim, Norway
> _______________________________________________
> users mailing list
> users at lists.sasview.org
> http://lists.sasview.org/cgi-bin/mailman/listinfo/users
>
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