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Heavy Rydberg states: large amplitude vibrations.

Adam Kirrander1, Christian Jungen2, Robert J Donovan1

  • 1EaStCHEM, School of Chemistry, University of Edinburgh, David Brewster Road, EH9 3FJ Edinburgh, UK. Adam.Kirrander@ed.ac.uk.

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Researchers report extremely large vibrational amplitude heavy Rydberg levels in the H2 (hydrogen molecule) 1Σ+g state. These findings advance understanding of molecular spectroscopy and quantum defect theory.

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Area of Science:

  • Molecular Physics
  • Quantum Chemistry
  • Spectroscopy

Background:

  • Heavy Rydberg states are molecular states with high principal quantum numbers.
  • Understanding these states is crucial for molecular spectroscopy and quantum defect theory.
  • The H2 molecule serves as a fundamental system for studying molecular behavior.

Purpose of the Study:

  • To report and characterize extremely large vibrational amplitude heavy Rydberg levels in the H2 1Σ+g state.
  • To investigate the behavior of these levels near the ion-pair dissociation limit.
  • To explore the applicability of theoretical models in describing these complex states.

Main Methods:

  • Utilizing a hybrid log derivative/multichannel quantum defect approach.
  • Accounting for predissociation effects in the calculations.
  • Analyzing resonance positions and widths of heavy Rydberg resonances.

Main Results:

  • Observed extremely large vibrational amplitude (≈8700 a.u.) heavy Rydberg levels.
  • Located these levels close to the ion-pair dissociation limit (25 cm⁻¹).
  • Derived absolute quantum defects for vibrational series from ν = 0 to ν = 2010.

Conclusions:

  • Demonstrated the influence of the Coulomb potential on heavy Rydberg behavior.
  • Showcased the continuity of heavy Rydberg characteristics across the 1Σ+g state manifold.
  • Highlighted the qualitative agreement of a diabatic model for resonance positions, but not widths.