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Pseudopotentials for correlated electron systems.

J R Trail1, R J Needs

  • 1Theory of Condensed Matter Group, Cavendish Laboratory, Cambridge, United Kingdom. jrt32@cam.ac.uk

The Journal of Chemical Physics
|July 5, 2013
PubMed
Summary
This summary is machine-generated.

A new method creates accurate pseudopotentials for light elements, improving correlated-electron calculations. These correlated electron pseudopotentials (CEPPs) offer better accuracy than previous methods for atomic and molecular properties.

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Area of Science:

  • Quantum Chemistry
  • Computational Physics
  • Materials Science

Background:

  • Pseudopotentials are crucial for simplifying electron correlation calculations.
  • Existing pseudopotentials may lack accuracy for certain elements and methods.
  • High-level quantum chemical calculations are computationally intensive.

Purpose of the Study:

  • To develop a novel scheme for generating pseudopotentials for correlated-electron calculations.
  • To create accurate pseudopotentials for light elements (H-F).
  • To evaluate the performance of these new pseudopotentials against established methods.

Main Methods:

  • Development of a pseudopotential generation scheme.
  • Utilizing high-level quantum chemical calculations for data generation.
  • Comparison with coupled cluster single double triple (CCSD(T)) calculations.

Main Results:

  • Reported pseudopotentials for H, Li, Be, B, C, N, O, and F.
  • CEPPs demonstrate improved accuracy for atomic energy levels.
  • CEPPs yield better molecular geometries and dissociation energies compared to Hartree-Fock-based pseudopotentials.

Conclusions:

  • The developed scheme effectively generates accurate correlated electron pseudopotentials (CEPPs).
  • CEPPs provide superior results in correlated-electron calculations for light elements.
  • This work offers a more reliable tool for computational studies in chemistry and physics.