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APS » Phys. Rev. Lett. » Volume 97 » Issue 18

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Phys. Rev. Lett. 97, 180404 (2006) [4 pages]

Observation of Heteronuclear Feshbach Molecules from a ⁸⁵Rb–⁸⁷Rb Gas

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S. B. Papp and C. E. Wieman
JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309-0440, USA

Received 3 August 2006; published 31 October 2006

Wereport on the observation of ultracold heteronuclear Feshbach molecules. Startingwith a ⁸⁷Rb Bose-Einstein condensate and a cold atomic gasof ⁸⁵Rb, we utilize previously unobserved interspecies Feshbach resonances tocreate up to 25 000 molecules. Even though the ⁸⁵Rb gasis nondegenerate, we observe a large molecular conversion efficiency dueto the presence of a quantum degenerate ⁸⁷Rb gas; thisrepresents a key feature of our system. We compare themolecule creation at two different Feshbach resonances with different magnetic-fieldwidths. The two Feshbach resonances are located at 265.44±0.15 G and372.4±1.3 G. We also directly measure the small binding energy ofthe molecules through resonant magnetic-field association.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.97.180404
DOI:	10.1103/PhysRevLett.97.180404
PACS:	05.30.Jp; 03.75.Nt; 34.50.-s; 36.90.+f 05.30.Jp Boson systems (quantum statistical mechanics) 03.75.Nt Other Bose-Einstein condensation phenomena 34.50.-s Scattering of atoms and molecules 36.90.+f Other exotic atoms and molecules; macromolecules; clusters (restricted to new topics in section 36) YEAR: 2006

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