Changeset eda8b30 in sasmodels for sasmodels/models/core_shell_parallelepiped.py
- Timestamp:
- Oct 28, 2017 4:42:15 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:
- 5f8b72b
- Parents:
- da5536f
- File:
-
- 1 edited
Legend:
- Unmodified
- Added
- Removed
-
sasmodels/models/core_shell_parallelepiped.py
r8f04da4 reda8b30 85 85 effective radius, for $S(Q)$ when $P(Q) * S(Q)$ is applied. 86 86 87 To provide easy access to the orientation of the parallelepiped, we define the 88 axis of the cylinder using three angles $\theta$, $\phi$ and $\Psi$. 89 (see :ref:`cylinder orientation <cylinder-angle-definition>`). 90 The angle $\Psi$ is the rotational angle around the *long_c* axis against the 91 $q$ plane. For example, $\Psi = 0$ when the *short_b* axis is parallel to the 92 *x*-axis of the detector. 87 For 2d data the orientation of the particle is required, described using 88 angles $\theta$, $\phi$ and $\Psi$ as in the diagrams below, for further details 89 of the calculation and angular dispersions see :ref:`orientation` . 90 The angle $\Psi$ is the rotational angle around the *long_c* axis. For example, 91 $\Psi = 0$ when the *short_b* axis is parallel to the *x*-axis of the detector. 93 92 94 93 .. figure:: img/parallelepiped_angle_definition.png 95 94 96 95 Definition of the angles for oriented core-shell parallelepipeds. 96 Note that rotation $\theta$, initially in the $xz$ plane, is carried out first, then 97 rotation $\phi$ about the $z$ axis, finally rotation $\Psi$ is now around the axis of the cylinder. 98 The neutron or X-ray beam is along the $z$ axis. 97 99 98 100 .. figure:: img/parallelepiped_angle_projection.png
Note: See TracChangeset
for help on using the changeset viewer.