The Rb₂ 3¹Π state: Observation and analysis.

Area of Science:

• Molecular Spectroscopy
• Quantum Mechanics
• Atomic and Molecular Physics

Background:

• Understanding the electronic states of diatomic molecules like Rubidium dimer (Rb2) is crucial for fundamental physics and chemistry.
• Accurate potential energy functions are essential for predicting molecular behavior and interpreting spectroscopic data.

Purpose of the Study:

• To experimentally determine rovibrational term values for the Rb2 3¹Π state.
• To develop and validate a new potential energy function for this state.
• To compare the developed model with existing ab initio calculations.

Main Methods:

• Utilized the optical-optical double resonance technique for high-resolution spectroscopy.
• Measured 323 rovibrational term values across a significant range of quantum numbers (J=7-77, v=2-23).
• Employed a piece-wise multi-parameter potential energy function based on generalized splines for data simulation.

Main Results:

• Successfully measured a comprehensive set of 323 rovibrational term values for the Rb2 3¹Π state.
• Developed a potential energy function that accurately reproduces the experimental term values.
• The model demonstrates uniform accuracy across the entire range, approximating available ab initio functions.

Conclusions:

• The study provides a highly accurate experimental characterization of the Rb2 3¹Π state.
• The developed potential energy function serves as a reliable model for this molecular state.
• This work enhances the understanding of interatomic interactions in diatomic molecules.