Name | Description | Category | Upload Date | Author | Score | Verified |
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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 |