  We report a computational study of the structural and energetic properties of
water clustersand singly-charged water cluster anions containing from 20 to 573
water molecules. We have used both a classical and a quantum description of the
molecular degrees of freedom. Water intra and inter-molecular interactions have
been modelled through the SPC/F model, while the water-excess electron
interaction has been described via the well-known Turi-Borgis potential. We
find that in general the quantum effects of the water degrees of freedom are
small, but they do influence the cluster-size at which the excess electron
stabilises inside the cluster, which occurs at smaller cluster sizes when
quantum effects are taken into consideration.
