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Abstract Quantum clusters are van der Waals aggregates of light atomic and molecular species whose behaviour is dominated by quantum delocalization and exchange effects. We summarize here recent theoretical and experimental studies of helium and molecular hydrogen clusters, focusing primarily on techniques developed to address the quantum nature of these systems. Indicators of superfluid behaviour are discussed, as well as the use of molecular probe species to study structural and dynamical properties.
K. Birgitta Whaley (Tue,) studied this question.