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Interaction potential for NaCs for ultracold scattering and spectroscopy

Brookes, S.G.H.; Hutson, J.M.

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S.G.H. Brookes


We obtain the interaction potential for NaCs by fitting to experiments on ultracold scattering and spectroscopy in optical tweezers. The central region of the potential has been accurately determined from Fourier-Transform spectroscopy at higher temperatures, so we focus on adjusting the long-range and short-range parts. We use coupled-channel calculations of binding energies and wave functions to understand the nature of the molecular states observed in ultracold spectroscopy, and of the state that causes the Feshbach resonance used to create ultracold NaCs molecules. We elucidate the relationships between the experimental quantities and features of the interaction potential. We establish the combinations of experimental quantities that determine particular features of the potential. We find that the long-range dispersion coefficient C6 must be increased by about 0.9% to 3256(1) Eha 6 0 to fit the experimental results. We use coupled-channel calculations on the final potential to predict bound-state energies and resonance positions.


Brookes, S., & Hutson, J. (2022). Interaction potential for NaCs for ultracold scattering and spectroscopy. The Journal of Physical Chemistry A, 126(25), 3987-4001.

Journal Article Type Article
Acceptance Date Jun 3, 2022
Online Publication Date Jun 17, 2022
Publication Date Jun 30, 2022
Deposit Date Jun 6, 2022
Publicly Available Date Jun 6, 2022
Journal Journal of Physical Chemistry A
Print ISSN 1089-5639
Electronic ISSN 1520-5215
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 126
Issue 25
Pages 3987-4001


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