Newly developed basis sets for density functional calculations.

Area of Science:

• Computational chemistry
• Quantum chemistry
• Materials science

Background:

• Accurate electronic structure calculations are crucial for understanding chemical and physical properties.
• Gaussian basis sets are fundamental tools in quantum chemistry for approximating atomic orbitals.
• Previous basis sets, optimized at the local-density functional level, had limitations for transition metals.

Purpose of the Study:

• To develop and present optimized contracted Gaussian basis sets of double-zeta valence polarized (DZVP) quality for first-row transition metals.
• To evaluate the performance of these new basis sets against experimental data and previous methods.
• To analyze the reasons for improved performance and assess their utility for other atomic properties.

Main Methods:

• Optimization of DZVP basis sets using the PWP86 generalized gradient approximation (GGA) and B3LYP hybrid functionals.
• Calculation of excitation energies for transition metal atoms and cations.
• Comparison of calculated excitation energies with experimental values and results from older basis sets.

Main Results:

• The newly developed DZVP basis sets demonstrate superior performance compared to previously available sets.
• Calculated excitation energies show excellent agreement with experimental data.
• The basis sets provide good estimations for other atomic properties, including ionization energies.

Conclusions:

• The optimized DZVP basis sets represent a significant improvement for the study of first-row transition metals.
• These basis sets enhance the accuracy of electronic structure calculations for atomic and potentially molecular properties.
• The findings facilitate more reliable computational investigations in chemistry and materials science.