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ElasticDiffRotDiscreteCircle

Description

Summary

This fitting function models the elastic part of the dynamics structure factor of a particle undergoing discrete jumps on N-sites evenly distributed in a circle. The particle can only jump to neighboring sites. This is the most common type of discrete rotational diffusion in a circle.

S(Q,E)≡=eiEt/I(Q,t)dt=A0(Q,r)δ(E)
A0(Q,r)=1NNk=1j0(2Qrsin(πkN))

This function makes up the elastic part of DiffRotDiscreteCircle.

Attributes (non-fitting parameters)

Name Type Default Description
N      
Q      
WorkspaceIndex      

N (integer, default=3) number of sites - Q (double, default=0.5) Momentum transfer

Properties (fitting parameters)

Name Default Description
Height 1.0 Scaling factor to be applied to the resolution.
Centre 0.0 Shift along the x-axis to be applied to the resolution.
Radius 1.0 Circle radius [Angstroms]

Categories: FitFunctions | QuasiElastic