Changeset 393facf in sasmodels for sasmodels/models/hollow_rectangular_prism.py
- Timestamp:
- Nov 6, 2017 2:25:04 AM (6 years ago)
- Branches:
- master, core_shell_microgels, magnetic_model, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests
- Children:
- 49eb251
- Parents:
- 8de1477
- File:
-
- 1 edited
Legend:
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sasmodels/models/hollow_rectangular_prism.py
r8de1477 r393facf 5 5 This model provides the form factor, $P(q)$, for a hollow rectangular 6 6 parallelepiped with a wall of thickness $\Delta$. 7 It computes only the 1D scattering, not the 2D. 7 8 8 9 9 Definition … … 66 66 (which is unitless). 67 67 68 **The 2D scattering intensity is not computed by this model.** 68 For 2d data the orientation of the particle is required, described using 69 angles $\theta$, $\phi$ and $\Psi$ as in the diagrams below, for further details 70 of the calculation and angular dispersions see :ref:`orientation` . 71 The angle $\Psi$ is the rotational angle around the long *C* axis. For example, 72 $\Psi = 0$ when the *B* axis is parallel to the *x*-axis of the detector. 73 74 For 2d, constraints must be applied during fitting to ensure that the inequality 75 $A < B < C$ is not violated, and hence the correct definition of angles is preserved. The calculation will not report an error, 76 but the results may be not correct. 77 78 .. figure:: img/parallelepiped_angle_definition.png 79 80 Definition of the angles for oriented hollow rectangular prism. 81 Note that rotation $\theta$, initially in the $xz$ plane, is carried out first, then 82 rotation $\phi$ about the $z$ axis, finally rotation $\Psi$ is now around the axis of the prism. 83 The neutron or X-ray beam is along the $z$ axis. 84 85 .. figure:: img/parallelepiped_angle_projection.png 86 87 Examples of the angles for oriented hollow rectangular prisms against the 88 detector plane. 69 89 70 90 … … 181 201 [{}, [0.2], [0.76687283098]], 182 202 ] 183
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