Precision Spectroscopy of Feshbach and Efimov Resonances of \textsuperscript{39}K

ORAL

Abstract

We measure the precise locations of Feshbach and Efimov resonances in \textsuperscript{39}K. We measure molecular binding energies down to a few-kilohertz level using dimer-dissociation spectroscopy. The stability of our magnetic field and the absence of monomers in our molecular gas enables us to determine the location of the Feshbach resonance with an uncertainty less than $10^{-4}$ of its width. The position of the first Efimov state is determined by measuring three-body loss rates, taking into account finite density and temperature effects.

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Authors

  • Roman Chapurin

    JILA, National Institute of Standards and Technology and University of Colorado

  • Xin Xie

    JILA, National Institute of Standards and Technology and University of Colorado

  • Michael Van de Graaff

    JILA, National Institute of Standards and Technology and University of Colorado, University of Colorado, Boulder

  • Carlos Lopez-Abadia

    JILA, National Institute of Standards and Technology and University of Colorado, University of Colorado, Boulder

  • Jared Popowski

    JILA, National Institute of Standards and Technology and University of Colorado, University of Colorado, Boulder

  • Jun Ye

    JILA, National Institute of Standards and Technology and University of Colorado, Univ of Colorado - Boulder, JILA, NIST and University of Colorado, Boulder, JILA

  • Eric Cornell

    JILA, National Institute of Standards and Technology and University of Colorado, University of Colorado, Boulder