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.

*PFC, NSF, NIST, NASA

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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