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A path integral Monte Carlo method has been used to study small (4He)N–Rb2(3Σu+) complexes at low temperatures. We focus our investigation on the range 1K⩽T⩽2K for aggregates of different sizes containing between 10 and 40 helium atoms. The extremely weak He–Rb 2 interaction, with a shallower potential depth and a longer equilibrium bond length than in the case of the He–He interaction, favors...
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