Spin State Energetics of VGe

Area of Science:

• Computational chemistry
• Materials science
• Quantum chemistry

Background:

• Vanadium-germanium (VGen) clusters are of interest for their unique electronic and structural properties.
• Understanding their low-lying states is crucial for predicting material behavior.

Purpose of the Study:

• Investigate the geometrical structures, electron configurations, and relative energies of VGen clusters (n=5-7).
• Determine the ground states of these clusters using theoretical methods.
• Validate computational findings with experimental spectroscopic data.

Main Methods:

• Density Functional Theory (DFT) with the GGA BP86 functional.
• Complete Active Space Self-Consistent Field (CASSCF) coupled with Second-Order Perturbation Theory (CASPT2).
• Analysis of adiabatic and vertical detachment energies (ADEs and VDEs).

Main Results:

• The GGA BP86 functional accurately predicted the relative energy ordering compared to CASPT2.
• Proposed ground states for VGen- (n=5-7) and VGen (n=5-7) clusters across different isomers.
• Calculated ADEs and VDEs showed good agreement with experimental 266 nm anion photoelectron spectra.

Conclusions:

• The study successfully characterized the electronic and geometric structures of VGen clusters.
• Theoretical calculations provide reliable predictions for these systems.
• Experimental validation confirms the accuracy of the employed computational methods.