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arXiv · 1312.3551

Production of optically trapped $^{87}$RbCs Feshbach molecules

Michael P. Köppinger·Daniel J. McCarron·Daniel L. Jenkin·Peter K. Molony·Hung-Wen Cho·Simon L. Cornish·C. Ruth Le Sueur·Caroline L. Blackley·Jeremy M. Hutson
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Abstract

We report the production of $^{87}$RbCs Feshbach molecules in a crossed-beam dipole trap. A mixture of $^{87}$Rb and $^{133}$Cs is cooled close to quantum degeneracy before an interspecies Feshbach resonance at 197\,G is used to associate up to $\sim5000$ molecules with a temperature of $\sim300$\,nK. The molecules are confined in the dipole trap with a lifetime of 0.21(1)\,s, long enough for future experiments exploring optical transfer to the absolute ground state. We have measured the magnetic moment of the Feshbach molecules in a magnetic bias field range between 181 and 185\,G to demonstrate the ability to control the character of the molecular state. In addition we have performed Feshbach spectroscopy in a field range from 0 to 1200\,G and located three previously unobserved resonances at high magnetic fields.

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Michael P. Köppinger, Daniel J. McCarron, Daniel L. Jenkin, Peter K. Molony, Hung-Wen Cho, Simon L. Cornish, C. Ruth Le Sueur, Caroline L. Blackley, Jeremy M. Hutson. 2013-12-12. Production of optically trapped $^{87}$RbCs Feshbach molecules. https://doi.org/10.1103/physreva.89.033604

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