Observation of Collisions between Two Ultracold Ground-State CaF Molecules

2020/01/31 by Lawrence W. Cheuk, Loïc Anderegg, Yicheng Bao +6
Chemistry · Physics and Astronomy · #Advanced Frequency and Time Standards #Atomic physics #Cold Atom Physics and Bose-Einstein Condensates #Electron #Excited state #Ground state #Hyperfine structure #Inelastic collision #Molecule #Nuclear physics #Optical tweezers #Optics #Physics #Quantum mechanics #Spectroscopy and Laser Applications #Trapping #Ultracold atom #cond-mat.quant-gas #physics.atom-ph

paper · pdf · doi:10.1103/physrevlett.125.043401

published as Phys. Rev. Lett. 125, 043401 (2020) · 5 pages, 4 figures

arxiv created 2020/01/31 · openalex publication_date 2020/07/20 · arxiv updated 2020/07/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We measure inelastic collisions between ultracold CaF molecules by combining two optical tweezers, each containing a single molecule. We observe collisions between ²Σ CaF molecules in the absolute ground state |X,v=0,N=0,F=0⟩, and in excited hyperfine and rotational states. In the absolute ground state, we find a two-body loss rate of 7(4)×10^-11 cm³/s, which is below, but close to, the predicted universal loss rate.

Citations

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