Heteronuclear molecules in an optical dipole trap

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J. J. Zirbel,¹ K.-K. Ni,¹ S. Ospelkaus,¹ T. L. Nicholson,¹ M. L. Olsen,¹ P. S. Julienne,² C. E. Wieman,¹ J. Ye,¹ and D. S. Jin¹
¹JILA, Quantum Physics Division, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA
²Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899-8423, USA

Received 31 December 2007; revised 11 March 2008; published 23 July 2008

Wereport on the creation and characterization of heteronuclear ⁴⁰K⁸⁷Rb Feshbachmolecules in an optical dipole trap. Starting from an ultracoldgas mixture of ⁴⁰K and ⁸⁷Rb atoms, we create asmany as 25 000 molecules at 300 nK by rf association.Optimizing the association process, we achieve a conversion efficiency of25%. We measure the temperature dependence of the rf associationprocess and find good agreement with a phenomenological model thathas previously been applied to Feshbach molecule creation by slowmagnetic-field sweeps. We also present a measurement of the bindingenergy of the heteronuclear molecules in the vicinity of theFeshbach resonance and provide evidence for Feshbach molecules as deeplybound as 26 MHz.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.78.013416
DOI:	10.1103/PhysRevA.78.013416
PACS:	37.10.Pq; 05.30.Jp; 05.30.Fk 37.10.Pq Trapping of molecules 05.30.Jp Boson systems (quantum statistical mechanics) 05.30.Fk Fermion systems and electron gas (quantum statistical mechanics) YEAR: 2008
KEYWORDS:	association, binding energy, potassium compounds, radiation pressure, resonant states

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