We report the implementation of nuclear magnetic resonance (NMR) shielding tensors within the four-component relativistic Kohn–Sham density functional theory including non-collinear spin magnetization and employing London atomic orbitals to ensure gauge origin independent results, together with a new and efficient scheme for assuring correct balance between the large and small components of a molecular four-component spinor in the presence of an external magnetic field (simple magnetic balance). To test our formalism we have carried out calculations of NMR shielding tensors for the HX series (X = F, Cl, Br, I, At), the Xe atom, and the Xe dimer. The advantage of simple magnetic balance scheme combined with the use of London atomic orbitals is the fast convergence of results (when compared with restricted kinetic balance) and elimination of linear dependencies in the basis set (when compared to unrestricted kinetic balance). The effect of including spin magnetization in the description of NMR shielding tensor has been found important for hydrogen atoms in heavy HX molecules, causing an increase of isotropic values of 10%, but negligible for heavy atoms.
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7 January 2012
Research Article|
January 04 2012
A simple scheme for magnetic balance in four-component relativistic Kohn–Sham calculations of nuclear magnetic resonance shielding constants in a Gaussian basis
Małgorzata Olejniczak;
Małgorzata Olejniczak
1Department of Chemistry,
University of Warsaw
, Pasteura 1, 02-093 Warsaw, Poland
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Radovan Bast;
Radovan Bast
2Centre for Theoretical and Computational Chemistry, Department of Chemistry,
University of Tromsø
, N–9037 Tromsø, Norway
3Laboratoire de Chimie et Physique Quantique (UMR 5626),
CNRS/Université de Toulouse 3 (Paul Sabatier)
, 118 route de Narbonne, 31062 Toulouse, France
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Trond Saue;
Trond Saue
3Laboratoire de Chimie et Physique Quantique (UMR 5626),
CNRS/Université de Toulouse 3 (Paul Sabatier)
, 118 route de Narbonne, 31062 Toulouse, France
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Magdalena Pecul
Magdalena Pecul
a)
1Department of Chemistry,
University of Warsaw
, Pasteura 1, 02-093 Warsaw, Poland
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
J. Chem. Phys. 136, 014108 (2012)
Article history
Received:
November 03 2011
Accepted:
December 01 2011
Citation
Małgorzata Olejniczak, Radovan Bast, Trond Saue, Magdalena Pecul; A simple scheme for magnetic balance in four-component relativistic Kohn–Sham calculations of nuclear magnetic resonance shielding constants in a Gaussian basis. J. Chem. Phys. 7 January 2012; 136 (1): 014108. https://doi.org/10.1063/1.3671390
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