Presenting concepts, theory, and computational approaches, Molecular Interactions covers long, intermediate, and short range interactions of molecules in their ground electronic state, interactions of electronically excited species, interactions of extended systems (such as chains, clusters and surfaces), and interactions in liquids and solids. This modern, comprehensive treatment of intermolecular forces acquaints advanced undergraduate and beginning graduate students as well as researchers with orders of magnitude of properties, useful models, and the theory and computational aspects needed to interpret and predict phenomena.