The European Physical Journal D

, Volume 65, Issue 1–2, pp 125–131 | Cite as

A high phase-space density mixture of 87Rb and 133Cs: towards ultracold heteronuclear molecules

  • H. W. Cho
  • D. J. McCarron
  • D. L. Jenkin
  • M. P. Köppinger
  • S. L. Cornish
Regular Article Cold and ultracold molecules


We report the production of a high phase-space density mixture of 87Rb and 133Cs atoms in a levitated crossed optical dipole trap as the first step towards the creation of ultracold RbCs molecules via magneto-association. We present a simple and robust experimental setup designed for the sympathetic cooling of 133Cs via interspecies elastic collisions with 87Rb. Working with the |F = 1,m F = +1〉 and the |3, +3〉 states of 87Rb and 133Cs respectively, we measure a high interspecies three-body inelastic collision rate ∼10−25−10−26 cm6   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 4(g)4 resonance at 19.8 G. These results represent important steps towards the creation of ultracold RbCs molecules in our apparatus.


87Rb Magnetic Trap 87Rb Atom Feshbach Resonance 133Cs Atom 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • H. W. Cho
    • 1
  • D. J. McCarron
    • 1
  • D. L. Jenkin
    • 1
  • M. P. Köppinger
    • 1
  • S. L. Cornish
    • 1
  1. 1.Department of PhysicsDurham University, Rochester Building, Science LaboratoriesDurhamUK

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