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Spontaneous dissociation of 85Rb Feshbach molecules.

S T Thompson1, E Hodby, C E Wieman

  • 1JILA, National Institute of Standards and Technology and the University of Colorado, and the Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA.

Physical Review Letters
|February 9, 2005
PubMed
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Researchers observed the spontaneous dissociation of Rubidium-85 (85Rb) dimers near a Feshbach resonance. Molecular lifetime strongly depends on magnetic fields, showing agreement with inelastic spin relaxation theory.

Area of Science:

  • Atomic, Molecular, and Optical (AMO) Physics
  • Quantum Chemistry
  • Condensed Matter Physics

Background:

  • Feshbach resonances are crucial for controlling ultracold atomic and molecular interactions.
  • Understanding molecular dissociation dynamics is key to applications in quantum simulation and precision measurement.
  • The highest lying vibrational states of molecules are sensitive probes of interatomic interactions.

Purpose of the Study:

  • To investigate the spontaneous dissociation of 85Rb dimers in the highest vibrational level.
  • To explore the magnetic field dependence of molecular lifetimes near a Feshbach resonance.
  • To validate theoretical models of molecular dissociation driven by inelastic spin relaxation.

Main Methods:

  • Production of 85Rb dimers using a Feshbach resonance.

Related Experiment Videos

  • Measurement of molecular lifetimes as a function of magnetic field.
  • Comparison of experimental data with theoretical predictions.

    • Main Results:

    • Observed spontaneous dissociation of 85Rb dimers in the highest vibrational state.
    • Demonstrated a strong magnetic field dependence of molecular lifetime, varying by three orders of magnitude.
    • Achieved molecule lifetimes of tens of milliseconds within a narrow magnetic field range (approx. 1 G) above the Feshbach resonance.

    Conclusions:

    • Experimental results align well with theoretical predictions involving inelastic spin relaxation.
    • Precise control over molecular lifetimes is achievable near Feshbach resonances.
    • This work provides insights into controlling ultracold molecular dynamics.