Abstract
A microcanonical (fixed energy) Monte Carlo method is described for the study of weakly bound heteroclusters. A model for calculating classical vibrational frequency shifts is also presented. Preliminary results are reported for He 8 I 2 and Ar 8 I 2 clusters. In the argon clusters, the I 2 frequency is red shifted but for He 8 I 2 a blue shift is found at higher solvent energies.