  Elementary excitations of the 4k$_F$ charge density wave state of a
quarter-filled strongly correlated electronic one-dimensional chain are
investigated in the presence of dispersionless quantum optical phonons using
Density Matrix Renormalization Group techniques. Such excitations are shown to
be topological unbound solitons carrying charge $e/2$. Relevance to the 4k$_F$
charge density wave instability in $\rm (DI-DCNQI)_2Ag$ or recently discovered
in (TMTTF)$_2$X (X=PF$_6$, AsF$_6$) is discussed.
