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Published Online August 21, 2003
Science DOI: 10.1126/science.1088876

Reports

Submitted on July 7, 2003
Accepted on August 11, 2003

Preparation of a Pure Molecular Quantum Gas

Jens Herbig 1, Tobias Kraemer 1, Michael Mark 1, Tino Weber 1, Cheng Chin 1, Hanns-Christoph Nägerl 1, Rudolf Grimm 1*

1 Institut für Experimentalphysik, Universität Innsbruck,Technikerstraß e 25, 6020 Innsbruck, Austria.

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

An ultracold molecular quantum gas is created by applying 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 allows to study the dynamics of the ensemble on extended time scales. We measure 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.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Quantum Gas of Deeply Bound Ground State Molecules.
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Bose-Einstein Condensation of Molecules.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)