On the 3¹Π_u state in caesium dimer

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.