Scattering of ultracold molecules in the highly resonant regime

2013/01/24 by Michael Mayle, Goulven Quéméner, Brandon Ruzic +2 · 23 citations
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Strong Light-Matter Interactions #Quantum, superfluid, helium dynamics

paper · doi:10.1103/physreva.87.012709

Abstract

Compared to purely atomic collisions, ultracold molecular collisions potentially support a much larger number of Fano-Feshbach resonances due to the enormous number of rovibrational states available. In fact, for alkali-metal dimers we find that the resulting density of resonances cannot be resolved at all, even on the sub-\ensuremathμK temperature scale of ultracold experiments. As a result, all observables become averaged over many resonances and can effectively be described by simpler, nonresonant scattering calculations. Two particular examples are discussed: nonchemically reactive RbCs and chemically reactive KRb. In the former case, the formation of a long-lived collision complex may lead to the ejection of molecules from a trap. In the latter case, chemical reactions broaden the resonances so much that they become unobservable.

Citations

• Statistical Aspects of Ultracold Resonant Scattering
• Lower Limit for the Energy Derivative of the Scattering Phase Shift

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Related

• Überresonant Scattering of Ultracold Molecules
• Statistical Aspects of Ultracold Resonant Scattering
• Tunable Feshbach resonances in collisions of ultracold molecules in ²Σ states with alkali-metal atoms
• Observation of resonant scattering between ultracold heteronuclear Feshbach molecules
• Long-range states and Feshbach resonances in collisions between ultracold alkali-metal diatomic molecules and atoms