SwePub - sökning: WFRF:(Tunell Ingvar)

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1.	Minaev, Boris, et al. (författare) Singlet-triplet transitions in three-atomic molecules studied by time-dependent MCSCF and density functional theory 2004 Ingår i: Molecular Physics. - : Informa UK Limited. - 0026-8976 .- 1362-3028. ; 102:13, s. 1391-1406 Tidskriftsartikel (refereegranskat)abstract Singlet-triplet transition moments and phosphorescence lifetimes have been calculated for the three-atomic molecules HCN, O-3, H2O, H2S, GeF2, GeCl2 and GeBr2 by time-dependent density functional theory (DFT) utilizing quadratic response functions in order to qualify DFT which recently has become available for studies of this kind [TUNELL, I., RINKEVIVIUS, Z., VAHTRAS, O., SALEK, P., HELGAKER, T., and AGREN, H., 2003, J. chem. phys., 119, 11024]. Comparison with ab initio and experimental data indicates that DFT exhibit results of similar quality as explicitly correlated methods which indicates that it indeed is a viable approach for singlet-triplet transitions. O-3 provides an intriguing example in that a systematic investigation of the singlet-triplet transition moment of its Wulf band indicates a clear advantage of the DFT technique despite the multiconfigurational character of the electronic structure of this molecule. The electronic spin-spin coupling and the hyperfine nuclear coupling constants have also been calculated in order to further characterize the triplet state in the spectra of the investigated systems.
2.	Tunell, Ingvar (författare) Density functional theory applied to phosphorescence 2004 Licentiatavhandling (övrigt vetenskapligt/konstnärligt)

Minaev, Boris, et al. (författare)
Singlet-triplet transitions in three-atomic molecules studied by time-dependent MCSCF and density functional theory
2004
Ingår i: Molecular Physics. - : Informa UK Limited. - 0026-8976 .- 1362-3028. ; 102:13, s. 1391-1406
Tidskriftsartikel (refereegranskat)abstract
- Singlet-triplet transition moments and phosphorescence lifetimes have been calculated for the three-atomic molecules HCN, O-3, H2O, H2S, GeF2, GeCl2 and GeBr2 by time-dependent density functional theory (DFT) utilizing quadratic response functions in order to qualify DFT which recently has become available for studies of this kind [TUNELL, I., RINKEVIVIUS, Z., VAHTRAS, O., SALEK, P., HELGAKER, T., and AGREN, H., 2003, J. chem. phys., 119, 11024]. Comparison with ab initio and experimental data indicates that DFT exhibit results of similar quality as explicitly correlated methods which indicates that it indeed is a viable approach for singlet-triplet transitions. O-3 provides an intriguing example in that a systematic investigation of the singlet-triplet transition moment of its Wulf band indicates a clear advantage of the DFT technique despite the multiconfigurational character of the electronic structure of this molecule. The electronic spin-spin coupling and the hyperfine nuclear coupling constants have also been calculated in order to further characterize the triplet state in the spectra of the investigated systems.

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