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Interaction Potential for NaCs for Ultracold Scattering and Spectroscopy.

Samuel G H Brookes1, Jeremy M Hutson1

  • 1Joint Quantum Centre (JQC) Durham-Newcastle, Department of Chemistry, Durham University, South Road, Durham DH1 3LE, United Kingdom.

The Journal of Physical Chemistry. A
|June 17, 2022
PubMed
Summary
This summary is machine-generated.

Researchers refined the interaction potential for sodium-cesium (NaCs) molecules by analyzing ultracold scattering and spectroscopy data. A key finding is the adjustment of the long-range dispersion coefficient C6 to accurately model NaCs molecular states.

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Area of Science:

  • Atomic, Molecular, and Optical (AMO) Physics
  • Quantum Chemistry
  • Spectroscopy

Background:

  • Accurate interatomic potentials are crucial for understanding and controlling ultracold molecules.
  • Sodium-cesium (NaCs) is a promising system for ultracold molecule research due to its unique properties.

Purpose of the Study:

  • To determine a precise interaction potential for NaCs molecules.
  • To correlate experimental observations in ultracold spectroscopy and scattering with features of the interaction potential.

Main Methods:

  • Fitting interaction potentials to experimental data from ultracold scattering and spectroscopy in optical tweezers.
  • Utilizing Fourier transform spectroscopy to determine the central region of the potential.
  • Employing coupled-channel calculations to analyze molecular states, binding energies, and wave functions.

Main Results:

  • The long-range dispersion coefficient C6 was adjusted to 3256(1)Eh a0^6, a 0.9% increase, to match experimental findings.
  • Established clear relationships between experimental observables and specific features of the NaCs interaction potential.
  • Identified the molecular state responsible for the Feshbach resonance used in creating ultracold NaCs molecules.

Conclusions:

  • The refined NaCs interaction potential accurately describes experimental data.
  • Coupled-channel calculations using the final potential can predict bound-state energies and Feshbach resonance positions.
  • This work provides a foundation for advanced studies and applications of ultracold NaCs molecules.