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The study of theweak attractions1, 2 between mole-cules is fundamental to an enormous variety of chemical and physical phenomena, including inelastic energy transfer, 3-5 photofragmentation dynamics, 6 line broad-ening, 7 theories of hydrogen bonding, 8 and transition between gas and condensed phases. 9 Such widespread relevance has served to catalyze considerable research effort toward elucidating the full potential energy surfaces that govern these weak but centrally important intermolecular forces. One of the most direct and sensitive probes of the topologyof these surfaces has been high-resolution rotational, vibrational, and elec-tronic spectroscopy to characterize the bound states of these weakly associated molecules. Indeed, the impressive power of methods based on high-resolution microwave10-11 and laser-induced fluorescence12 (LIF)