  A quaternionic commutator bracket for position and momentum shows that the
quaternionic wave function, \emph{viz.}
$\widetilde{\psi}=(\frac{i}{c}\,\psi_0\,,\vec{\psi})$, represents a state of a
particle with orbital angular momentum, $L=3\,\hbar$, resulting from the
internal structure of the particle. This angular momentum can be attributed to
spin of the particle. The vector $\vec{\psi}$, points along the direction of
$\vec{L}$. When a charged particle is placed in an electromagnetic fields the
interaction energy reveals that the magnetic moments interact with the electric
and magnetic fields giving rise to terms similar to Aharonov-Bohm and
Aharonov-Casher effects.
