# Changeset cb0dc22 in sasmodels

Ignore:
Timestamp:
Mar 24, 2017 12:20:51 AM (3 years ago)
Branches:
master, core_shell_microgels, costrafo411, magnetic_model, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests
Children:
9f91afe, 3a45c2c, d810d96, 6cff473
Parents:
1aa7990
Message:

document known issue in cs parallelepiped and the fact that it is not
completely understood and under review. ticken #786 can now be moved to
release 4.2

File:
1 edited

### Legend:

Unmodified
 r797a8e3 Calculates the form factor for a rectangular solid with a core-shell structure. **The thickness and the scattering length density of the shell or "rim" can be different on all three (pairs) of faces.** The thickness and the scattering length density of the shell or "rim" can be different on each (pair) of faces. However at this time the model does **NOT** actually calculate a c face rim despite the presence of the parameter. .. note:: This model was originally ported from NIST IGOR macros. However,t is not yet fully understood by the SasView developers and is currently review. The form factor is normalized by the particle volume $V$ such that V = ABC + 2t_ABC + 2t_BAC + 2t_CAB **meaning that there are "gaps" at the corners of the solid.** **meaning that there are "gaps" at the corners of the solid.**  Again note that $t_C = 0$ currently. The intensity calculated follows the :ref:parallelepiped model, with the amplitudes of the core and shell, in the same manner as a core-shell model. .. math:: F_{a}(Q,\alpha,\beta)= \Bigg(\frac{sin(Q(L_A+2t_A)/2sin\alpha sin\beta)}{Q(L_A+2t_A)/2sin\alpha sin\beta)} - \frac{sin(QL_A/2sin\alpha sin\beta)}{QL_A/2sin\alpha sin\beta)} \Bigg) + \frac{sin(QL_B/2sin\alpha sin\beta)}{QL_B/2sin\alpha sin\beta)} + \frac{sin(QL_C/2sin\alpha sin\beta)}{QL_C/2sin\alpha sin\beta)} .. note:: detector plane. Validation ---------- The model uses the form factor calculations implemented in a c-library provided by the NIST Center for Neutron Research (Kline, 2006). References ---------- * **Author:** NIST IGOR/DANSE **Date:** pre 2010 * **Last Modified by:** Paul Butler **Date:** September 30, 2016 * **Last Reviewed by:** Miguel Gonzales **Date:** March 21, 2016 * **Converted to sasmodels by:** Miguel Gonzales **Date:** February 26, 2016 * **Last Modified by:** Wojciech Potrzebowski **Date:** January 11, 2017 * **Currently Under review by:** Paul Butler """