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Laser Physics

, Volume 20, Issue 1, pp 23–31 | Cite as

Collisions of ultracold trapped cesium Feshbach molecules

  • F. Ferlaino
  • S. Knoop
  • M. Berninger
  • M. Mark
  • H. -C. Nägerl
  • R. GrimmEmail author
Papers

Abstract

We study collisions in an optically trapped, pure sample of ultracold Cs2 molecules in various internal states. The molecular gas is created by Feshbach association from a near-degenerate atomic gas, with adjustable temperatures in the nanokelvin range. We identify several narrow loss resonances, which point to the coupling to more complex molecular states and may be interpreted as Feshbach resonances in dimerdimer interactions. Moreover, in some molecular states we observe a surprising temperature dependence in collisional loss. This shows that the situation cannot be understood in terms of the usual simple threshold behavior for inelastic two-body collisions. We interpret this observation as further evidence for a more complex molecular structure beyond the well-understood dimer physics.

Keywords

Laser Physics Molecular State Feshbach Resonance Dipole Trap Optical Dipole Trap 
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

© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  • F. Ferlaino
    • 1
  • S. Knoop
    • 1
  • M. Berninger
    • 1
  • M. Mark
    • 1
  • H. -C. Nägerl
    • 1
  • R. Grimm
    • 1
    • 2
    Email author
  1. 1.Institut für Experimentalphysik and Zentrum für QuantenphysikUniversität InnsbruckInnsbruckAustria
  2. 2.Institut für Quantenoptik und QuanteninformationÖsterreichische Akademie der WissenschaftenInnsbruckAustria

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