  We study the theory of scattering for the Zakharov system in space dimension
3. We prove in particular the existence of wave operators for that system with
no size restriction on the data in larger spaces and for more general
asymptotic states than were previously considered, and we determine convergence
rates in time of solutions in the range of the wave operators to the solutions
of the underlying linear system. We also consider the same system in space
dimension 2, where we prove the existence of wave operators in the special case
of vanishing asymptotic data for the wave field.
