The structure factor for ellipsoids, cylinders and polydisperse spheres
Name of the a file (optional):
Upload of a file is
If a file is uploaded the structure factor will be calculated at the same q-values as the input file.
Furthermore it is possible to download the product as well as the quotient of the input file and the structure factor.
If no input
at all is provided, the structure factor for an ellipsoid
of maximum half axis = 10, axial ratio 2.0 and volume fraction 0.2 is calculated.
Just press the "submit" button below.
Press the questionmark again to make this box disappear.
For ellipsoids and cylinders the axial ratio may be entered instead of b:
First and last point used in data file. Default: all points used.
(a is half the length of the symmmetry axis)
For spheres a is the radius R and
b is the relative width (sigma/R - Eq. 14 in the ref)
of the distribution.
For ellipsoids and cylinders b should be chosen such that the axial ratio is between 0.4 and 2.5.
For spheres the relative polydispersity entered here as b should be a number less than 1.0.
Enter the volume fraction here.
Maximum volume fraction 0.3.
e for ellipsoid (default)
c for cylinder
s for schultz size distribution of spheres
g for gaussian size distribution of spheres
Estimate axial ratio for the scatterer (used only with Debye transformation).
Default: prolate - enter a value < 1 for oblate.
NB: value referring to an ellipsoid of revolution!
Leave empty for no concentration effects (default).
The exact value entered here may influence the result when the information content of the data is low.
Start with a small number e.g. 0.01 to avoid numerical instabilities and long cpu times.
[N]o or fit by [M]oment (default) or [E]vidence (used only with Debye transformation).
NB: Value referring to an ellipsoid of revolution.
Pls send me an e-mail in case anything does not work as expected.