  Generalization of Gaussian trial wave functions in quantum molecular dynamics
models is introduced, which allows for long-range correlations characteristic
for composite nuclear fragments. We demonstrate a significant improvement in
the description of light fragments with the correlations. Utilizing either type
of Gaussian wave functions, with or without correlations, however, we find that
we cannot describe fragment formation in a dynamic situation. Composite
fragments are only produced in simulations if these fragments are present as
clusters in the substructure of original nuclei. The difficulty is traced to
the delocalization of wave functions during emission. Composite fragments are
produced abundantly in the Gaussian molecular dynamics in the limit hbar -> 0.
