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For a Hamiltonian of interacting particles
one can not expect
the eigenstates to be a single Slater determinant.
The completeness of the space spanned by all Slater determinants
can be used to approach the diagonalization in several steps. At first a
part of the full Hamiltonian is diagonalized (usually not only the
single-particle Hamiltonian but also some contributions from
the interaction between the particles). This defines a
single-particle basis
and simultaneously the space
of all Slater determinants (excited states). The solution is afterwards
improve by giving appropriate admixtures of excited states yielding
a correlated state.