Changeset 3b8a004 in sasmodels


Ignore:
Timestamp:
Jun 28, 2018 11:15:49 AM (4 years ago)
Author:
richardh
Branches:
master, core_shell_microgels, magnetic_model, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests
Children:
05cd67f
Parents:
4476951
Message:

minor docs change

File:
1 edited

Legend:

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Added
Removed
  • sasmodels/models/guinier.py

    r4476951 r3b8a004  
    2121 
    2222Note that $R_g^2$ may be negative, which happens when a form factor $P(Q)$ is 
    23 increasing with $Q$ rather than decreasing. This can occur for core or shell 
     23increasing with $Q$ rather than decreasing. This can occur for core/shell 
    2424particles, hollow particles, or for composite particles with domains of 
    2525different SLDs in a solvent with an SLD close to the average match point. 
    26 (Alternatively, it might be regarded as there being an internal inter-domain 
     26(Alternatively, this might be regarded as there being an internal inter-domain 
    2727"structure factor" within a single particle which gives rise to a peak in the 
    2828scattering). 
    2929 
    3030To specify a negative value of $R_g^2$ in SasView, simply give $R_g$ a negative 
    31 value ($R_g^2$ will be evaluated as $R_g |R_g|$). 
    32  
    33 Note that the physical radius of gyration, of the exterior of the particle, 
    34 will still be large and positive. It is only the apparent size from the small 
    35 $Q$ data that will give a small or negative value of $R_g^2$. 
     31value ($R_g^2$ will be evaluated as $R_g |R_g|$). Note that the physical radius  
     32of gyration, of the exterior of the particle, will still be large and positive.  
     33It is only the apparent size from the small $Q$ data that will give a small or  
     34negative value of $R_g^2$. 
    3635 
    3736References 
     
    8180 
    8281# parameters for demo 
    83 demo = dict(scale=1.0, rg=60.0) 
     82demo = dict(scale=1.0,  background=0.001, rg=60.0 ) 
    8483 
    8584# parameters for unit tests 
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