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On the 31Πu state in caesium dimer.

Jacek Szczepkowski1, Anna Grochola1, Wlodzimierz Jastrzebski1

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Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|April 3, 2021
PubMed
Summary

This study used polarization labeling spectroscopy to investigate the Cs2 molecule's 3^1Πu state. Researchers identified strong perturbations affecting vibrational levels and determined energies for 3352 rovibronic levels.

Keywords:
Alkali dimersElectronic statesLaser spectroscopyPerturbations

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Area of Science:

  • Molecular Spectroscopy
  • Quantum Chemistry
  • Atomic and Molecular Physics

Background:

  • The cesium dimer (Cs2) is a key system for studying molecular interactions and electronic states.
  • Understanding the electronic structure of diatomic molecules is crucial for various fields, including quantum computing and Bose-Einstein condensates.

Purpose of the Study:

  • To investigate the 3^1Πu electronic state of the Cs2 molecule using advanced spectroscopic techniques.
  • To characterize the equilibrium constants and identify perturbations within the 3^1Πu state.

Main Methods:

  • Employing the polarization labeling spectroscopy technique for high-resolution analysis.
  • Analyzing the spectral data to determine molecular constants and identify perturbations.

Main Results:

  • Determined equilibrium constants for the 3^1Πu state: Te=20684.56 cm⁻¹, ωe=30.62 cm⁻¹, and Re=5.27 Å.
  • Observed strong perturbations in vibrational levels v=4-35 due to interactions with neighboring electronic states.
  • Mapped the energies of 3352 rovibronic levels within the perturbed complex.

Conclusions:

  • The 3^1Πu state of Cs2 is significantly influenced by interactions with other electronic states.
  • The detailed rovibronic level structure provides critical data for theoretical modeling and understanding interatomic potentials.