Hall-Ross

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.

The Hall-Ross Jump diffusion model [1] has the form:

Gamma(Q) = (1-exp(-l*Q^2))/tau

Properties (fitting parameters)

Name Default Description
Tau 1.0 Residence time
L 0.2 Jump length

References

[1]P L Hall & D K Ross Mol Phys 36 1549 (1978)

Categories: FitFunctions | QuasiElastic

Source

Python: HallRoss.py