ElasticDiffSphere

Description

This fitting function models the elastic part of the dynamics structure factor of a particle undergoing continuous diffusion but confined to a spherical volume, ElasticDiffSphere.

S(Q,Eω)=(3j1(QR)QR)2(QR)δ(ω)

Because of the spherical symmetry of the problem, the structure factor is expressed in terms of the jl(z) spherical Bessel functions.

Attributes (non-fitting parameters)

Name

Type

Default

Description

Q

WorkspaceIndex

Q (double, default=1.0) 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

2.0

Sphere radius

Categories: FitFunctions | QuasiElastic

Source

C++ header: ElasticDiffSphere.h

C++ source: ElasticDiffSphere.cpp