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Ultracold silver-atom collisions and the formation of silver dimers by photo- and magneto-association

Eite Tiesinga

Jacek Kłos

Hui Li and Svetlana Kotochigova*

David DeMille

  • *Contact author: skotoch@temple.edu
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Phys. Rev. A 111, 062814 – Published 17 June, 2025

DOI: https://doi.org/10.1103/rd26-sgz1

Abstract

We have performed three theoretical simulations relevant for describing collisions among laser-cooled silver atoms and for the formation of Ag2 molecules from these colliding atoms. Firstly, we determined the relativistic electronic structure of Ag2 molecules in ground and low-lying excited states. Secondly, we computed rotational and vibrational levels of the ground and excited electronic states as well as rovibrationally averaged electric transition dipole moments. Using this knowledge, we analyzed a simplified quantum-mechanical model of the one-photon photoassociation process to form electronically excited Ag2 from microkelvin Ag atoms and make predictions for lineshapes and saturation effects as functions of laser frequency and intensity. Finally and thirdly, we performed coupled-channels calculations, numerical solutions of sets of coupled radial Schrödinger equations of ultracold ground-state Ag collisions in an external magnetic field. These calculations include the effects of two Born-Oppenheimer potentials as well as hyperfine Fermi-contact and Zeeman interactions. We discuss the expected range of s-wave scattering lengths as well as strengths and distribution of Fano-Feshbach resonances as a function of the magnetic-field strength for the Ag107 and Ag109 isotopes. We highlight the periodicity of the scattering length with small changes in the depths of the Born-Oppenheimer potentials. The Fano-Feshbach resonances can be used to magneto-associate ultracold Ag atoms into weakly bound ground-state Ag2 dimers.

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Phys. Rev. A 111, 062814– Published 17 June, 2025
  • Received 18 January 2025
  • Accepted 28 May 2025
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