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ChudleyElliotSQE¶
Description¶
This fitting function models the dynamic structure factor for a particle undergoing jump diffusion using the Chudley-Elliot Jump diffusion model [1].
where:
\(Height\) - Intensity scaling, a fit parameter
\(Centre\) - Centre of peak, a fit parameter
\(Tau\) - Residence time, a fit parameter
\(l\) - Jump lengths, a fit parameter
\(Q\) - Momentum transfer, an attribute (non-fitting)
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.
Attributes (non-fitting parameters)¶
Name |
Type |
Default |
Description |
---|---|---|---|
Q |
|||
WorkspaceIndex |
Properties (fitting parameters)¶
Name |
Default |
Description |
---|---|---|
Height |
1.0 |
scaling factor |
Centre |
0.0 |
Shift along the X-axis |
Tau |
1.25 |
Residence time |
L |
1.25 |
Jump length |
References¶
Categories: FitFunctions | QuasiElastic
Source¶
C++ header: ChudleyElliotSQE.h
C++ source: ChudleyElliotSQE.cpp