Changeset 40a87fa in sasmodels for sasmodels/models/guinier.py
- Timestamp:
- Aug 8, 2016 9:24:11 AM (8 years ago)
- Branches:
- master, core_shell_microgels, costrafo411, magnetic_model, release_v0.94, release_v0.95, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests
- Children:
- 2472141
- Parents:
- 2d65d51
- File:
-
- 1 edited
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sasmodels/models/guinier.py
r2c74c11 r40a87fa 5 5 This model fits the Guinier function 6 6 7 .. math:: I(q) = scale \exp{\left[ \frac{-Q^2R_g^2}{3} \right]}7 .. math:: 8 8 9 to the data directly without any need for linearisation 10 (*cf*. the usual plot of $\ln I(q)$ vs $q^2$\ ). Note that you may have to 11 restrict the data range to include small q only, where the Guinier approximation 12 actually applies. See also the guinier_porod model. 9 I(q) = \text{scale} \cdot \exp{\left[ \frac{-Q^2R_g^2}{3} \right]} 10 + \text{background} 11 12 to the data directly without any need for linearisation (*cf*. the usual 13 plot of $\ln I(q)$ vs $q^2$\ ). Note that you may have to restrict the data 14 range to include small q only, where the Guinier approximation actually 15 applies. See also the guinier_porod model. 13 16 14 17 For 2D data the scattering intensity is calculated in the same way as 1D, 15 18 where the $q$ vector is defined as 16 19 17 .. math:: q =\sqrt{q_x^2 + q_y^2}20 .. math:: q = \sqrt{q_x^2 + q_y^2} 18 21 19 22 References
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