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Fick Diffusion¶

Description¶

Models the Q dependence of the QENS line width (Gamma (hwhm)), diffusion coefficients (D), residence times (tau) and jump lengths (l) to extract the associated long range diffusive motions of molecules. Fick’s law for diffusion has the form:

$Gamma(Q) = D \cdot Q^{2},$

where $D=\langle l^{2} \rangle \cdot \frac{Q^2}{6} \cdot tau$

Properties (fitting parameters)¶

Name	Default	Description
D	1.0	Diffusion constant

Categories: FitFunctions | QuasiElastic

Source¶

Python: FickDiffusion.py