Chudley-Elliot

Description

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:

Gamma(Q) = (1 - sin(Ql)/Ql)/tau

Properties (fitting parameters)

Name Default Description
Tau 1.0 Residence time
L 1.5 Jump length

References

[1]C T Chudley and R J Elliott 1961 Proc. Phys. Soc. 77 353

Categories: FitFunctions | QuasiElastic

Source

Python: ChudleyElliot.py