.. index:: ElasticDiffRotDiscreteCircle
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) \equiv = \int e^{-iEt/\hbar} I(Q,t) dt = A_0(Q,r) \delta (E)
A_0(Q,r) = \frac{1}{N} \sum_{k=1}^{N} j_0( 2 Q r sin(\frac{\pi k}{N}) )
This function makes up the elastic part of :ref:`DiffRotDiscreteCircle <func-DiffRotDiscreteCircle>`.
.. attributes::
N (integer, default=3) number of sites - Q (double, default=0.5) Momentum transfer
.. properties::
.. categories::
.. sourcelink::