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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 ∼ 5000 molecules with a temperature of ∼ 300 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.

Publisher's copyright statement:The original publication is available at www.springerlink.com Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Cs respectively, we measure a high interspecies three-body inelastic collision rate ∼ 10 −24 cm 6 s −1 which hinders the sympathetic cooling. Nevertheless by careful tailoring of the evaporation we can produce phase-space densities near quantum degeneracy for both species simultaneously. In addition we report the observation of an interspecies Feshbach resonance at 181.7(5) G and demonstrate the creation of Cs2 molecules via magneto-association on the 4g(4) resonance at 19.8 G. These results represent important steps towards the creation of ultracold RbCs molecules in our apparatus.

Citation for published item:flkleyD groline vF nd ve ueurD gF uth nd rutsonD teremy wF nd wgrronD hniel tF nd u¤ oppingerD wihel F nd ghoD rungEen nd tenkinD hniel vF nd gornishD imon vF @PHIQA 9peshh resonnes in ultrold VSF9D hysil review eFD VU @QAF HQQTIIF Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. 85 Rb. Seven of the resonances are in the ground-state channel (f,m f ) = (2,+2) + (2,+2) and nine are in the excited-state channel (2,−2) + (2,−2). We find a wide resonance at high field in each of the two channels, offering possibilities for the formation of larger 85 Rb condensates and studies of few-body physics. A detailed coupled-channel analysis is presented to characterize the resonances and also provides an understanding of the inelastic losses observed in the excited-state channel. In addition we have confirmed the existence of one narrow resonance in a (2,+2) + (3,+3) spin mixture.

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