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Keywords:

  • ab initio calculations;
  • density functional calculations;
  • electronic structure;
  • relativistic quantum chemistry;
  • theoretical chemistry

Graphical Abstract

Thumbnail image of graphical abstract

Entering Dirac territory: This Minireview provides a guide to two- and four-component relativistic Hamiltonians for use in quantum chemistry with particular emphasis on the recently developed eXact two-component (X2C) Hamiltonian.