  Monte Carlo simulations using a hybrid quantum and classical mechanical
potential were performed for crystal and amorphous-like HCl-water(n) clusters
The subsystem composed by HCl and one water molecule was treated within Density
Functional Theory, and a classical force field was used for the rest of the
system. Simulations performed at 200 K suggest that the energetic feasibility
of HCl dissociation strongly depends on its initial placement within the
cluster. An important degree of ionization occurs only if HCl is incorporated
into the surface. We observe that local melting does not play a crucial role in
the ionization process.
