Two open-shell formulations of the symmetry-adapted perturbation theory are presented. They are based on the spin-unrestricted Kohn-Sham (SAPT(UKS)) and unrestricted Hartree-Fock (SAPT(UHF)) descriptions of the monomers, respectively. The key reason behind development of SAPT(UKS) is that it is more compatible with density functional theory (DFT) compared to the previous formulation of open-shell SAPT based on spin-restricted Kohn-Sham method of Żuchowski et al [J. Chem. Phys. 129, 084101 (2008) https://doi.org/10.1063/1.2968556]. The performance of SAPT(UKS) and SAPT(UHF) is tested for the following open-shell van der Waals complexes: He⋯NH, H2O⋯HO2, He⋯OH, Ar⋯OH, Ar⋯NO. The results show an excellent agreement between SAPT(UKS) and SAPT(ROKS). Furthermore, for the first time SAPT based on DFT is shown to be suitable for the treatment of interactions involving Π-state radicals (He⋯OH, Ar⋯OH, Ar⋯NO). In the interactions of transition metal dimers (|$^3\Sigma _u^+$|)Au2 and (|$^{13}\Sigma _g^+$|)Cr2 we show that SAPT is incompatible with the use of effective core potentials. The interaction energies of both systems expressed instead as supermolecular UHF interaction plus dispersion from SAPT(UKS) result in reasonably accurate potential curves.
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28 October 2012
Research Article|
October 23 2012
Symmetry-adapted perturbation theory based on unrestricted Kohn-Sham orbitals for high-spin open-shell van der Waals complexes
Michał Hapka;
Michał Hapka
a)
1Faculty of Chemistry,
University of Warsaw
, 02-093 Warsaw, Pasteura 1, Poland
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Piotr S. Żuchowski;
Piotr S. Żuchowski
b)
2Institute of Physics,
Nicolaus Copernicus University
, Grudziądzka 5, 87-100 Toruń, Poland
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Małgorzata M. Szczęśniak;
Małgorzata M. Szczęśniak
3Department of Chemistry,
Oakland University
, Rochester, Michigan 48309-4477, USA
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Grzegorz Chałasiński
Grzegorz Chałasiński
1Faculty of Chemistry,
University of Warsaw
, 02-093 Warsaw, Pasteura 1, Poland
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a)
Electronic mail: hapka@tiger.chem.uw.edu.pl.
b)
Electronic mail: pzuch@fizyka.umk.pl.
J. Chem. Phys. 137, 164104 (2012)
Article history
Received:
August 02 2012
Accepted:
September 27 2012
Citation
Michał Hapka, Piotr S. Żuchowski, Małgorzata M. Szczęśniak, Grzegorz Chałasiński; Symmetry-adapted perturbation theory based on unrestricted Kohn-Sham orbitals for high-spin open-shell van der Waals complexes. J. Chem. Phys. 28 October 2012; 137 (16): 164104. https://doi.org/10.1063/1.4758455
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