Correlated electron pseudopotentials for 3d-transition metals

Area of Science:

• Computational Chemistry
• Quantum Chemistry
• Solid State Physics

Background:

• Correlated Electron Pseudopotentials (CEPPs) are crucial for accurately modeling electron interactions.
• Existing pseudopotential methods often struggle with the complex electronic structures of transition metals.
• Incorporating relativistic effects is essential for heavy elements.

Purpose of the Study:

• To adapt the Correlated Electron Pseudopotentials (CEPPs) method for 3d-transition metals.
• To include relativistic effects in the new CEPPs.
• To develop and validate new CEPPs for atoms Sc through Fe.

Main Methods:

• Atomic quantum chemical calculations were performed to construct new CEPPs.
• Coupled cluster singles doubles and triples (CCSD(T)) calculations were used for validation.
• Comparison of CEPPs with all-electron results for molecular properties.

Main Results:

• New CEPPs were generated for Sc-Fe, accounting for correlated and relativistic electrons.
• CEPPs demonstrated superior performance in correlated-electron calculations.
• Dissociation energies, molecular geometries, and zero-point vibrational energies were accurately reproduced.

Conclusions:

• The adapted CEPPs method provides a more accurate description of 3d-transition metals.
• These new pseudopotentials outperform previous Hartree-Fock-based methods.
• The findings enable more reliable computational studies of transition metal compounds.