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A long-standing goal in the field of cluster research has been to elucidate the transition between the properties of isolated monomer species in the gas phase and the corresponding properties in the condensed phase. Some of the most exacting methods of studying small clusters in this transition region are offered by high resolution spectroscopies (1-6), particularly in the near-and far-IR, which have succeeded in providing the first detailed glimpses of the quantum level structure that corresponds to both low frequency van der Waals motion and high frequency intramolecular motion in the molecular aggregates. In a very tangible sense, we are beginning to realize one of the long-standing dreams of the physical chem ist-that of watching molecules in the process of a collision by measuring