Measurement of inelastic losses in a sample of ultracold Rb-85
| Autor: | Cristina Figl, P. A. Altin, Rachel Poldy, Nicholas Robins, John Close, John Debs, Daniel Doering |
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| Rok vydání: | 2009 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Sympathetic cooling Zeeman effect Atomic Physics (physics.atom-ph) Resonance FOS: Physical sciences Atomic and Molecular Physics and Optics Magnetic field Physics - Atomic Physics Dipole symbols.namesake Orders of magnitude (time) Magnetic trap symbols Physics::Atomic Physics Atomic physics Feshbach resonance |
| DOI: | 10.48550/arxiv.0902.2229 |
| Popis: | We report on the observation and characterisation of an inelastic loss feature in collisions between ultracold Rb-85 |F=2, m_F=-2> atoms at a magnetic field of 220 G. Our apparatus creates ultracold Rb-85 clouds by sympathetic cooling with a Rb-87 reservoir, and can produce pure Rb-87 condensates of 10^6 atoms by a combination of evaporative cooling in a quadrupole-Ioffe magnetic trap and further evaporation in a weak, large-volume optical dipole trap. By combining Rb-85 and Rb-87 atoms collected in a dual-species magneto-optical trap and selectively evaporating the heavier isotope, we demonstrate strong sympathetic cooling of the Rb-85 cloud, increasing its phase space density by three orders of magnitude with no detectable loss in number. We have used ultracold samples created in this way to observe the variation of inelastic loss in ultracold Rb-85 as a function of magnetic field near the 155 G Feshbach resonance. We have also measured a previously unobserved loss feature at 219.9(1) G with a width of 0.28(6) G, which we associate with a narrow Feshbach resonance predicted by theory. 4 pages, 3 figures, content changed |
| Databáze: | OpenAIRE |
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