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We report the first observation of translationally cold ( ~90μK) Rb₂ molecules. They are produced in a magneto-optical trap in their triplet ground state. The detection is performed by selective mass spectroscopy after two-photon ionization into Rb₂⁺, resonantly enhanced through the intermediate a³Σᵤ⁺→2³Πg molecular band. The two rubidium isotopes present very different types of behavior that are interpreted in terms of their respective collisional properties.
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Gabbanini et al. (2000) studied this question.
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