| Guinier Porod |
Calculates the scattering for a generalized Guinier/power law object. This is an empirical model that can be used to determine the size and dimensionality of scattering objects, including asymmetri... |
Shape-Independent |
15 Sep 2016 |
sasview |
0 |
|
| RPA models |
Calculates the macroscopic scattering intensity for a multi-component homogeneous mixture of polymers using the Random Phase Approximation. This general formalism contains 10 specific cases
Case... |
Shape-Independent |
15 Sep 2016 |
butler |
0 |
|
| star_polymer_v2 |
Reparametrised version, fits Rg not Rg^2^
Documentation corrected, see ticket #962, with grateful thanks to Ziang Li for pointing out the issues.
The models is still noisy at very small Q when Rg... |
Shape-Independent |
22 May 2017 |
richardh |
0 |
|
| Porod |
This model fits the Porod function
$$ I(q) = C/q^4
$$
to the data directly without any need for linearisation (cf. Log I(q) vs Log q).
Here $C = 2\pi (\Delta\rho)^2 S_v$ is the scale factor ... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Peak Lorentz |
This model describes a Lorentzian shaped peak on a flat background.
Definition
The scattering intensity $I(q)$ is calculated as
$$ I(q) = \frac{scale}{\bigl(1+\bigl(\frac{q-q_0}{B}\big... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Broad Peak |
Definition
This model calculates an empirical functional form for SAS data characterized by a broad scattering peak. Many SAS spectra are characterized by a broad peak even though they are fr... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Mass Surface Fractal |
A number of natural and commercial processes form high-surface area materials as a result of the vapour-phase aggregation of primary particles. Examples of such materials include soots, aerosols... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Rpa |
Definition
Calculates the macroscopic scattering intensity for a multi-component homogeneous mixture of polymers using the Random Phase Approximation. This general formalism contains 10 speci... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Poly Gauss Coil |
#poly_gauss_coil model #conversion of Poly_GaussCoil.py #converted by Steve King, Mar 2016 This empirical model describes the scattering from *polydisperse* polymer chains in theta solvents or poly... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Be Polyelectrolyte |
.. note:: Please read the Validation section below.
Definition
This model calculates the structure factor of a polyelectrolyte solution with the RPA expression derived by Borue and Erukhimovi... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Polymer Excl Volume |
This model describes the scattering from polymer chains subject to excluded volume effects and has been used as a template for describing mass fractals.
Definition
The form factor was orig... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Mass Fractal |
Calculates the scattering from fractal-like aggregates based on the Mildner reference.
Definition
The scattering intensity $I(q)$ is calculated as
$$ I(q) = scale \times P(q)S(q) + bac... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Gel Fit |
*This model was implemented by an interested user!*
Unlike a concentrated polymer solution, the fine-scale polymer distribution in a gel involves at least two characteristic length scales, a sho... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Spinodal |
Definition
This model calculates the SAS signal of a phase separating system undergoing spinodal decomposition. The scattering intensity $I(q)$ is calculated as
$$ I(q) = I_{max}\frac{(1+\... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Gaussian Peak |
Definition
This model describes a Gaussian shaped peak on a flat background
$$ I(q) = (\text{scale}) \exp\left[ -\tfrac12 (q-q_0)^2 / \sigma^2 \right] + \text{background}
$$
with the ... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Teubner Strey |
Definition
This model calculates the scattered intensity of a two-component system using the Teubner-Strey model. Unlike `dab` this function generates a peak. A two-phase material can be char... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Fractal |
Definition
This model calculates the scattering from fractal-like aggregates of spherical building blocks according the following equation:
$$ I(q) = \phi\ V_\text{block} (\rho_\text{block} ... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Lorentz |
Lorentz (Ornstein-Zernicke Model)
Definition
The Ornstein-Zernicke model is defined by
$$ I(q)=\frac{\text{scale}}{1+(qL)^2}+\text{background}
$$
The parameter $L$ is the screening len... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Power Law |
#power_law model #conversion of PowerLawAbsModel.py #converted by Steve King, Dec 2015
This model calculates a simple power law with a flat background.
Definition
$$ I(q) = \text{scale... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|
| Line |
This model calculates intensity using simple linear function
Definition
The scattering intensity $I(q)$ is calculated as
$$ I(q) = \text{scale} (A + B \cdot q) + \text{background}
$$
... |
Shape-Independent |
07 Sep 2017 |
sasview |
0 |
|