Opened 17 months ago

Last modified 17 months ago

#1259 new enhancement

Prefactor calculation when there are both P(Q) and S(Q)

Reported by: yunliu Owned by: yunliu
Priority: minor Milestone: SasView 5.0.0
Component: sasmodels Keywords: scale
Cc: richardh Work Package: SasModels Model Issues

Description

The models for vesicle and sphere systems ( P(Q) ) with the hard sphere interaction ( S(Q) ) have two volume fraction: phi_PQ and phi_SQ.
phi_PQ is the volume fraction from the form factor.
phi_SQ is the volume fraction from the structure factor.

Based on the testing of the two models, the prefactor of the scattering intensity is currently set up to be proportional to scale*phi_PQ*phi_SQ.

If the scale is set up to one, the prefactor with the absolute intensity should be proportional to phi_PQ only.
It should not be phi_PQ*phi_SQ.

It is suggested to remove phi_SQ from the calculation of the prefactor.

Attachments (1)

TestResults-SphereVesicles-SASView.docx (1.5 MB) - added by yunliu 17 months ago.

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Change History (4)

Changed 17 months ago by yunliu

comment:1 Changed 17 months ago by yunliu

  • Milestone changed from SasView 5.1.0 to SasView 5.0.0

comment:2 Changed 17 months ago by yunliu

Forgot to mention that the prefactor calculation is the same for both V4.1.2 and V5.0.

comment:3 Changed 17 months ago by pkienzle

I think this is duplicate of #1257, and is fixed by the following sasmodels PR

https://github.com/SasView/sasmodels/pull/101

Changes between 4 and 5 probably depend on which version of sasmodels is active.

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