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Models Uploaded by sasview:

Name Description
Hollow Cylinder Definition This model provides the form factor, $P(q)$, for a monodisperse hollow right angle circular cylinder (rigid tube) where the The inside and outside of the hollow cylinder are assumed to have the same SLD and the form factor is thus n…
Barbell Definition Calculates the scattering from a barbell-shaped cylinder. Like capped-cylinder, this is a sphereocylinder with spherical end caps that have a radius larger than that of the cylinder, but with the center of the end cap radius lyin…
Lamellar Stack Paracrystal # Note: model title and parameter table are inserted automatically This model calculates the scattering from a stack of repeating lamellar structures. The stacks of lamellae (infinite in lateral dimension) are treated as a paracrystal to account for…
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 peak having height of *scale* centered at $q_0$ and …
Unified Power Rg Definition This model employs the empirical multiple level unified Exponential/Power-law fit method developed by Beaucage. Four functions are included so that 1, 2, 3, or 4 levels can be used. In addition a 0 level has been added which simply …
Lamellar Hg Stack Caille # Note: model title and parameter table are inserted automatically This model provides the scattering intensity, $I(q) = P(q)S(q)$, for a lamellar phase where a random distribution in solution are assumed. Here a Caille $S(q)$ is used for the lamell…
Spinodal Definition This model calculates the SAS signal of a phase separating system undergoing spinodal decomposition. The scattering intensity $I(q)$ is calculated as $$I(q) = I_{max}\frac{(1+\gamma/2)x^2}{\gamma/2+x^{2+\gamma}}+B$$ where $x=q… Ellipsoid # ellipsoid model # Note: model title and parameter table are inserted automatically The form factor is normalized by the particle volume Definition The output of the 2D scattering intensity function for oriented ellipsoids is given by (Fei… Pearl Necklace This model provides the form factor for a pearl necklace composed of two elements: *N* pearls (homogeneous spheres of radius *R*) freely jointed by *M* rods (like strings - with a total mass *Mw* = *M* \* *m*r + *N* \* *m*\ s, and the string seg… Sc Paracrystal .. warning:: This model and this model description are under review following concerns raised by SasView users. If you need to use this model, please email help@sasview.org for the latest situation. *The SasVie… Lamellar Polydispersity in the bilayer thickness can be applied from the GUI. Definition The scattering intensity$I(q)$for dilute, randomly oriented, "infinitely large" sheets or lamellae is $$I(q) = \text{scale}\frac{2\pi P(q)}{q^2\delta} + … Polymer Excl Volume This model describes the scattering from polymer chains subject to excluded volume effects and has been used as a template for describing mass fractals. Definition The form factor was originally presented in the following integral form (Ben… Mass Fractal Calculates the scattering from fractal-like aggregates based on the Mildner reference. Definition The scattering intensity I(q) is calculated as$$ I(q) = scale \times P(q)S(q) + background  P(q) = F(qR)^2  F(x) = \frac{… Flexible Cylinder This model provides the form factor,$P(q)$, for a flexible cylinder where the form factor is normalized by the volume of the cylinder. **Inter-cylinder interactions are NOT provided for.**$\$ P(q) = \text{scale} \left<F^2\right>/V + \text{backg…
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 Erukhimovich. Note however that the fitting procedure here do…
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