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Why Specific ETOs are Advantageous for NMR and Molecular Interactions

  • Philip E. Hoggan
  • Ahmed Bouferguène
Chapter
Part of the Progress in Theoretical Chemistry and Physics book series (PTCP, volume 22)

Abstract

This paper advocates use of the atomic orbitals which have direct physical interpretation, i.e., Coulomb Sturmians and hydrogen-like orbitals. They are exponential type orbitals (ETOs). Their radial nodes are shown to be essential in obtaining accurate local energy for Quantum Monte Carlo, molecular interactions a nuclear and shielding tensors for NMR work. The NMR work builds on a 2003 French PhD and many numerical results were published by 2007. The improvements in this paper are noteworthy, the key being the actual basis function choice. Until 2008, their products on different atoms were difficult to manipulate for the evaluation of two-electron integrals. Coulomb resolutions provide an excellent approximation that reduces these integrals to a sum of one-electron overlap-like integral products that each involve orbitals on at most two centers. Such two-center integrals are separable in prolate spheroidal co-ordinates. They are thus readily evaluated. Only these integrals need to be re-evaluated to change basis functions. In this paper, a review of the translation procedures for Slater type orbitals (STO) and for Coulomb Sturmians follows that of the more recent application to ETOs of a particularly convenient Coulomb resolution.

Keywords

Density Functional Theory Quantum Monte Carlo Trial Wave Function Slater Type Orbital Partial Positive Charge 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Philip E. Hoggan
    • 1
  • Ahmed Bouferguène
    • 2
  1. 1.LASMEA, CNRS and Université Blaise PascalAubièreFrance
  2. 2.University of AlbertaEdmontonCanada

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