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One-electron spin-orbit contribution by effective nuclear charges.

Sandro G Chiodo1, Nino Russo

  • 1Dipartimento di Chimica and Centro di Calcolo ad Alte Prestazioni per Elaborazioni Parallele e Distribuite-Centro d'Eccellenza MIUR, Università della Calabria, I-87030, Arcavacata di Rende (CS), Italy.

Journal of Computational Chemistry
|September 19, 2008
PubMed
Summary

New effective nuclear charges for main group elements enable accurate spin-orbit (SO) calculations in large molecules. These parameters provide a good approximation to the full SO Hamiltonian, simplifying complex quantum chemistry computations.

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Area of Science:

  • Quantum Chemistry
  • Atomic Physics
  • Computational Chemistry

Background:

  • Spin-orbit (SO) coupling is crucial for understanding electronic structures and spectra.
  • Accurate SO calculations for large molecular systems remain computationally challenging.
  • Developing efficient approximations for the SO Hamiltonian is essential for theoretical chemistry.

Purpose of the Study:

  • To develop effective nuclear charges for main group elements (rows 2-5).
  • To enable accurate one-electron spin-orbit coupling calculations in large molecular systems.
  • To provide a reliable approximation to the full spin-orbit Hamiltonian.

Main Methods:

  • Derived atomic effective nuclear charges using a fitting procedure.
  • Employed a noniterative scheme for calculating SO contributions via direct coupling between II states.
  • Optimized II states at the B3LYP level using DZVP basis sets.
  • Validated parameters by computing fine-structure splitting (FSS) of doublet and triplet II states in AH species.

Main Results:

  • Developed effective nuclear charges applicable to main group elements from the second to the fifth row.
  • Demonstrated that these parameters offer a remarkably good approximation to the full SO Hamiltonian.
  • Successfully computed fine-structure splitting (FSS) for various diatomic species, showing good agreement with experimental data.

Conclusions:

  • The developed effective nuclear charges are suitable for SO calculations of large molecular systems.
  • These parameters offer a computationally efficient and accurate approach to approximate the full SO Hamiltonian.
  • The methodology provides a valuable tool for theoretical investigations of electronic structures and spectroscopic properties.