Bose-Einstein Condensation of Molecules

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Science  19 Dec 2003:
Vol. 302, Issue 5653, pp. 2101-2103
DOI: 10.1126/science.1093280

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We report on the Bose-Einstein condensation of more than 105 Li2 molecules in an optical trap starting from a spin mixture of fermionic lithium atoms. During forced evaporative cooling, the molecules are formed by three-body recombination near a Feshbach resonance and finally condense in a long-lived thermal equilibrium state. We measured the characteristic frequency of a collective excitation mode and demonstrated the magnetic field–dependent mean field by controlled condensate spilling.

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