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Feshbach spectroscopy of an ultracold mixture of Rb-85 and Cs-133.

Cho, H.W. and McCarron, D.J. and Köppinger, M.P. and Jenkin, D.L. and Butler, K.L. and Julienne, P.S. and Blackley, C.L. and Le Sueur, C.R. and Hutson, J.M. and Cornish, S.L. (2013) 'Feshbach spectroscopy of an ultracold mixture of Rb-85 and Cs-133.', Physical review A., 87 (1). 010703.


We report the observation of interspecies Feshbach resonances in an optically trapped mixture of 85Rb and 133Cs. We measure nine resonances in the lowest spin channel for a magnetic field range from 0 to 700 G and show that they are in good agreement with coupled-channel calculations. The interspecies background scattering length is close to zero over a large range of magnetic fields, permitting the sensitive detection of Feshbach resonances through interspecies thermalization. Our results confirm the quality of the Rb-Cs potential curves [ Phys. Rev. A 85 032506 (2012)] and offer promising starting points for the production of ultracold polar molecules.

Item Type:Article
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Publisher statement:© 2013 American Physical Society
Date accepted:No date available
Date deposited:26 April 2013
Date of first online publication:January 2013
Date first made open access:No date available

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