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Originally published in Science Express on 13 November 2003
Science 19 December 2003:
Vol. 302. no. 5653, pp. 2101 - 2103
DOI: 10.1126/science.1093280
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Reports

Bose-Einstein Condensation of Molecules

S. Jochim,1 M. Bartenstein,1 A. Altmeyer,1 G. Hendl,1 S. Riedl,1 C. Chin,1 J. Hecker Denschlag,1 R. Grimm1,2*

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.

1 Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria.
2 Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria.

* To whom correspondence should be addressed. E-mail: rudolf.grimm{at}uibk.ac.at

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