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Models the Q dependence of the QENS line width (Gamma (hwhm)), diffusion coefficients (D), residence times (tau) and jump lengths (length) to extract the associated long range diffusive motions of molecules.
The Chudley-Elliot Jump diffusion model [1] has the form:
Units of \(l\) are inverse units of \(Q\).
Units of \(HWHM\) are \(meV\) if units of \(\tau\) are ps. Alternatively, units of \(HWHM\) are \(\mu eV\) if units of \(\tau\) are ns.
Name | Default | Description |
---|---|---|
Tau | 1.0 | Residence time |
L | 1.5 | Jump length |
[1] | C T Chudley and R J Elliott 1961 Proc. Phys. Soc. 77 353 |
Categories: FitFunctions | QuasiElastic
Python: ChudleyElliot.py (last modified: 2020-03-27)