The process of electron photodetachment in the
I-Ar2 cluster is chosen for testing new approximate
quantum dynamical methods - the Classical Separable Potential (CSP) approach
and its Configuration Interaction (CI-CSP) extension. The results
are encouraging in the sense of a quantitative agreement between the CSP
and the established Time-Dependent Self-Consistent Field schemes, and
in the fact that inclusion of correlations via the CI-CSP approach brings
the results significantly closer to numerically exact ones. These
findings justify applying the new methods to fast dynamical processes
in moderately quantal large polyatomic systems, where other approaches
become computationally extremely demanding or unfeasible.