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Jurgilas S, Chakraborty A, Rich CJH, et al. Collisions between Ultracold Molecules and Atoms in a Magnetic Trap. Phys Rev Lett. 2021;126(15):153401doi: 10.1103/PhysRevLett.126.153401.
Jurgilas, S., Chakraborty, A., Rich, C. J. H., Caldwell, L., Williams, H. J., Fitch, N. J., Sauer, B. E., Frye, M. D., Hutson, J. M., & Tarbutt, M. R. (2021). Collisions between Ultracold Molecules and Atoms in a Magnetic Trap. Physical review letters, 126(15), 153401. https://doi.org/10.1103/PhysRevLett.126.153401
Jurgilas, S, et al. "Collisions between Ultracold Molecules and Atoms in a Magnetic Trap." Physical review letters vol. 126,15 (2021): 153401. doi: https://doi.org/10.1103/PhysRevLett.126.153401
Jurgilas S, Chakraborty A, Rich CJH, Caldwell L, Williams HJ, Fitch NJ, Sauer BE, Frye MD, Hutson JM, Tarbutt MR. Collisions between Ultracold Molecules and Atoms in a Magnetic Trap. Phys Rev Lett. 2021 Apr 16;126(15):153401. doi: 10.1103/PhysRevLett.126.153401. PMID: 33929220.
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Phys Rev Lett. 2021 Apr 16;126(15):153401. doi: 10.1103/PhysRevLett.126.153401.

Collisions between Ultracold Molecules and Atoms in a Magnetic Trap.

Physical review letters

S Jurgilas, A Chakraborty, C J H Rich, L Caldwell, H J Williams, N J Fitch, B E Sauer, Matthew D Frye, Jeremy M Hutson, M R Tarbutt

Affiliations

  1. Centre for Cold Matter, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, United Kingdom.
  2. Joint Quantum Centre (JQC) Durham-Newcastle, Department of Chemistry, Durham University, South Road, Durham DH1 3LE, United Kingdom.

PMID: 33929220 DOI: 10.1103/PhysRevLett.126.153401

Abstract

We prepare mixtures of ultracold CaF molecules and Rb atoms in a magnetic trap and study their inelastic collisions. When the atoms are prepared in the spin-stretched state and the molecules in the spin-stretched component of the first rotationally excited state, they collide inelastically with a rate coefficient k_{2}=(6.6±1.5)×10^{-11}  cm^{3}/s at temperatures near 100  μK. We attribute this to rotation-changing collisions. When the molecules are in the ground rotational state we see no inelastic loss and set an upper bound on the spin-relaxation rate coefficient of k_{2}<5.8×10^{-12}  cm^{3}/s with 95% confidence. We compare these measurements to the results of a single-channel loss model based on quantum defect theory. The comparison suggests a short-range loss parameter close to unity for rotationally excited molecules, but below 0.04 for molecules in the rotational ground state.

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