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Magnetic Field Dependence of Ultracold Inelastic Collisions near a Feshbach Resonance

J. L. Roberts

JILA, Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

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N. R. Claussen

JILA, Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

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S. L. Cornish

JILA, Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

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, and

C. E. Wieman

JILA, Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

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https://doi.org/10.1142/9789812813787_0080Cited by:0 (Source: Crossref)

Abstract:

Inelastic collision rates for ultracold ⁸⁵Rb atoms in the F = 2, m_f = −2 state have been measured as a function of magnetic field. At 250 gauss (G), the two- and three-body loss rates were measured to be K₂= (1.87 ± 0.95 ± 0.19) × 10⁻¹⁴ cm³/s and . respectively. As the magnetic field is decreased from 250 G towards a Feshbach resonance at 155 G. the inelastic rates decrease to a minimum and then increase dramatically, peaking at the Feshbach resonance. Both two- and three-body losses are important, and individual contributions have been compared with theory.

PACS: 34.50.−s, 03.75.Fi, 05.30.Jp, 32.80.Pj

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Magnetic Field Dependence of Ultracold Inelastic Collisions near a Feshbach Resonance

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