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Originally published in Science Express on 21 August 2003
Science 12 September 2003:
Vol. 301. no. 5639, pp. 1510 - 1513
DOI: 10.1126/science.1088876
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Reports

Preparation of a Pure Molecular Quantum Gas

Jens Herbig, Tobias Kraemer, Michael Mark, Tino Weber, Cheng Chin, Hanns-Christoph Nägerl, Rudolf Grimm*

An ultracold molecular quantum gas is created by application of a magnetic field sweep across a Feshbach resonance to a Bose-Einstein condensate of cesium atoms. The ability to separate the molecules from the atoms permits direct imaging of the pure molecular sample. Magnetic levitation enables study of the dynamics of the ensemble on extended time scales. We measured ultralow expansion energies in the range of a few nanokelvin for a sample of 3000 molecules. Our observations are consistent with the presence of a macroscopic molecular matter wave.

Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria.

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

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Quantum Gas of Deeply Bound Ground State Molecules.
J. G. Danzl, E. Haller, M. Gustavsson, M. J. Mark, R. Hart, N. Bouloufa, O. Dulieu, H. Ritsch, and H.-C. Nagerl (2008)
Science 321, 1062-1066
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Bose-Einstein Condensation of Molecules.
S. Jochim, M. Bartenstein, A. Altmeyer, G. Hendl, S. Riedl, C. Chin, J. Hecker Denschlag, and R. Grimm (2003)
Science 302, 2101-2103
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