1. Ab initio calculation of the spectrum of Feshbach resonances in NaLi + Na collisions
- Author
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Karman, Tijs, Gronowski, Marcin, Tomza, Michal, Park, Juliana J., Son, Hyungmok, Lu, Yu-Kun, Jamison, Alan O., and Ketterle, Wolfgang
- Subjects
Physics - Atomic Physics ,Physics - Chemical Physics - Abstract
We present a combined experimental and theoretical study of the spectrum of magnetically tunable Feshbach resonances in NaLi $(a^3\Sigma^+)$ $+$ Na collisions. In the accompanying paper, we observe experimentally 8 and 17 resonances occur between $B=0$ and $1400$~G in upper and lower spin-stretched states, respectively. Here, we perform ab initio calculations of the NaLi $+$ Na interaction potential and describe in detail the coupled-channel scattering calculations of the Feshbach resonance spectrum. The positions of the resonances cannot be predicted with realistic uncertainty in the state-of-the-art ab initio potential, but our calculations yield a typical number of resonances that is in near-quantitative agreement with experiment. We show that the main coupling mechanism results from spin-rotation and spin-spin couplings in combination with the anisotropic atom-molecule interaction. The calculations furthermore explain the qualitative difference between the numbers of resonances in either spin state.
- Published
- 2023
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