Comparing the electric field gradient at chlorine from two-centre and one-centre wavefunction expansion calculations on HCl

Author: Grabenstetter J.E.   Whitehead M.A.  

Publisher: Taylor & Francis Ltd

ISSN: 1362-3028

Source: Molecular Physics, Vol.34, Iss.6, 1977-12, pp. : 1577-1582

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Abstract

A one-centre expansion wavefunction, electric field gradient, OCE-EFG, is compared with the effective field gradients from accurate two-centre expansion wavefunctions, TCE-EFG. The OCE-EFG is shown to be accurate; it is computationally economical. Guseinov's formula, for expanding elliptical coordinates as the product of two Legendre polynomials on different centres, is used to evaluate the two-centre integrals over Slater type orbitals, STOs.