Electronic transitions of palladium dimer

Area of Science:

• Physical Chemistry
• Spectroscopy
• Materials Science

Background:

• Palladium dimer (Pd2) is a molecule with potential applications in catalysis and materials science.
• Understanding the electronic structure and transitions of Pd2 is crucial for exploring its properties.
• Previous studies on Pd2 electronic transitions were limited, necessitating further experimental investigation.

Purpose of the Study:

• To experimentally investigate the electronic transitions of gas-phase palladium dimer (Pd2).
• To analyze the laser-induced fluorescence spectrum of Pd2 in the visible region.
• To determine key molecular parameters of the ground electronic state of Pd2.

Main Methods:

• Gas-phase palladium dimer (Pd2) was generated using laser ablation of a palladium metal rod.
• Laser-induced fluorescence (LIF) spectroscopy was employed to observe the spectrum in the visible region (480–700 nm).
• Observed vibrational bands were assigned to specific electronic transition systems.

Main Results:

• Eleven vibrational bands were observed and assigned to the [17.1](3)Πg-X(3)Σu(+) transition system.
• The bond length (ro) of the ground X(3)Σu(+) state was determined to be 2.47(4) Å.
• The vibrational frequency (ΔG1∕2) of the ground X(3)Σu(+) state was determined to be 211.4(5) cm(-1).

Conclusions:

• This work represents the first gas-phase experimental investigation of the electronic transitions of palladium dimer (Pd2).
• The determined molecular parameters provide valuable data for theoretical modeling and understanding of Pd2.
• The study enhances the understanding of the electronic structure and properties of diatomic palladium.