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Precision Spectroscopy of Negative-Ion Resonances in Ultralong-Range Rydberg Molecules.

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We studied ultracold atoms in Rydberg molecules to understand negative ion states. Our findings reveal new details about rubidium anion fine structure and electron scattering resonances.

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Area of Science:

  • Atomic Physics
  • Quantum Chemistry
  • Spectroscopy

Background:

  • Negative ion structure near the electron detachment limit influences electron-neutral scattering.
  • Ultralong-range Rydberg molecules offer a sensitive platform for studying atomic-scale interactions.

Purpose of the Study:

  • Investigate near-threshold anion states using Rydberg molecules.
  • Probe electron-neutral scattering with high precision.
  • Explore the fine structure of the rubidium anion (Rb⁻).

Main Methods:

  • Utilizing ultracold atoms within Rydberg orbits to form Rydberg molecules.
  • High-precision spectroscopic measurements to probe the system's energy levels.
  • Analyzing scattering resonances and fine structure deviations from theory.

Main Results:

  • Observed the previously uncharacterized fine structure of the Rb⁻ ^{3}P_{J} triplet.
  • Extracted parameters for p-wave scattering resonances, showing deviations from theoretical predictions.
  • Identified a new Rydberg molecule alignment mechanism driven by spin-orbit coupling in the negative ion.

Conclusions:

  • Ultralong-range Rydberg molecules provide atomic-scale sensitivity to electron-neutral scattering.
  • The study offers detailed insights into near-threshold anion states.
  • New experimental data challenges existing theoretical models for Rb⁻ scattering resonances.