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Published Online November 13, 2003
Science DOI: 10.1126/science.1093280

Reports

Submitted on November 4, 2003
Accepted on November 11, 2003

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. Grimm 2*

1 Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria.
2 Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria; 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.

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 measure the characteristic frequency of a collective excitation mode and demonstrate the magnetic-field dependent mean field by controlled condensate spilling.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)