Search Results - Helgaker, Trygve

Trygve Helgaker

Trygve Helgaker (born August 11, 1953, in Porsgrunn, Norway) is professor of chemistry, Department of Chemistry, University of Oslo, Norway.

He is a member of the International Academy of Quantum Molecular Science, 2005.

He has written more than 200 scientific papers, and the book, ''Molecular Electronic-Structure Theory'' (Trygve Helgaker, Poul Jørgensen, and Jeppe Olsen, Wiley, Chichester, 2000). He is one of the main authors of the DALTON program. Provided by Wikipedia
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  1. 1
    Alternative representations of the correlation energy in density-functional theory: a kinetic-energy based adiabatic connection

    Alternative representations of the correlation energy in density-functional theory: a kinetic-energy based adiabatic connection by Teale, Andrew M., Helgaker, Trygve, Savin, Andreas

    Published 2015
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  2. 2
    Differentiable but exact formulation of density-functional theory

    Differentiable but exact formulation of density-functional theory by Kvaal, Simen, Ekström, Ulf, Teale, Andrew M., Helgaker, Trygve

    Published 2014
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  3. 3
    Electron localisation function in current-density-functional theory

    Electron localisation function in current-density-functional theory by Furness, James W., Ekström, Ulf, Helgaker, Trygve, Teale, Andrew M.

    Published 2016
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  4. 4
    Calculating excitation energies by extrapolation along adiabatic connections

    Calculating excitation energies by extrapolation along adiabatic connections by Rebolini, Elisa, Toulouse, Julien, Teale, Andrew M., Helgaker, Trygve, Savin, Andreas

    Published 2015
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  5. 5
    Excited states from range-separated density-functional perturbation theory

    Excited states from range-separated density-functional perturbation theory by Rebolini, Elisa, Toulouse, Julien, Teale, Andrew M., Helgaker, Trygve, Savin, Andreas

    Published 2015
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  6. 6
    Excitation energies from Görling–Levy perturbation theory along the range-separated adiabatic connection

    Excitation energies from Görling–Levy perturbation theory along the range-separated adiabatic connection by Rebolini, Elisa, Teale, Andrew M., Helgaker, Trygve, Savin, Andreas, Toulouse, Julien

    Published 2018
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  7. 7
    Fractional electron loss in approximate DFT and Hartree–Fock theory

    Fractional electron loss in approximate DFT and Hartree–Fock theory by Peach, Michael J.G., Teale, Andrew M., Helgaker, Trygve, Tozer, David J.

    Published 2015
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  8. 8
    Magnetic-field density-functional theory (BDFT): lessons from the adiabatic connection

    Magnetic-field density-functional theory (BDFT): lessons from the adiabatic connection by Reimann, Sarah, Borgoo, Alex, Tellgren, Erik I., Teale, Andrew M., Helgaker, Trygve

    Published 2017
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  9. 9
    Uniform magnetic fields in density-functional theory

    Uniform magnetic fields in density-functional theory by Tellgren, Erik I., Laestadius, Andre, Helgaker, Trygve, Kvaal, Simen, Teale, Andrew M.

    Published 2018
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  10. 10
    The importance of current contributions to shielding constants in density-functional theory

    The importance of current contributions to shielding constants in density-functional theory by Reimann, Sarah, Ekström, Ulf, Stopkowicz, Stella, Teale, Andrew M., Borgoo, Alex, Helgaker, Trygve

    Published 2015
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  11. 11
    Non-perturbative calculation of molecular magnetic properties within current-density functional theory

    Non-perturbative calculation of molecular magnetic properties within current-density functional theory by Tellgren, Erik I., Teale, Andrew M., Furness, James W., Lange, K.K., Ekström, Ulf, Helgaker, Trygve

    Published 2014
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  12. 12
    Connections between variation principles at the interface of wave-function and density-functional theories

    Connections between variation principles at the interface of wave-function and density-functional theories by Irons, Tom J.P., Furness, James W., Ryley, Matthew S., Zemen, Jan, Helgaker, Trygve, Teale, Andrew M.

    Published 2017
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  13. 13
    Kohn–Sham energy decomposition for molecules in a magnetic field

    Kohn–Sham energy decomposition for molecules in a magnetic field by Reimann, Sarah, Borgoo, Alex, Austad, Jon, Tellgren, Erik I., Teale, Andrew M., Helgaker, Trygve, Stopkowicz, Stella

    Published 2019
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  14. 14
    Current density functional theory using meta-generalized gradient exchange-correlation functionals

    Current density functional theory using meta-generalized gradient exchange-correlation functionals by Furness, James W., Verbeke, Joachim, Tellgren, Erik I., Stopkowicz, Stella, Ekström, Ulf, Helgaker, Trygve, Teale, Andrew M.

    Published 2015
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  15. 15
    Molecular properties in the Tamm–Dancoff approximation: indirect nuclear spin–spin coupling constants

    Molecular properties in the Tamm–Dancoff approximation: indirect nuclear spin–spin coupling constants by Cheng, Chi Y., Ryley, Matthew S., Peach, Michael J.G., Tozer, David J., Helgaker, Trygve, Teale, Andrew M.

    Published 2015
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  16. 16
    The Dalton quantum chemistry program system

    The Dalton quantum chemistry program system by Aidas, Kestutis, Angeli, Celestino, Bak, Keld L., Bakken, Vebjørn, Bast, Radovan, Boman, Linus, Christiansen, Ove, Cimiraglia, Renzo, Coriani, Sonia, Dahle, Pål, Dalskov, Erik K., Ekström, Ulf, Enevoldsen, Thomas, Eriksen, Janus J., Ettenhuber, Patrick, Fernández, Berta, Ferrighi, Lara, Fliegl, Heike, Frediani, Luca, Hald, Kasper, Halkier, Asger, Hättig, Christof, Heiberg, Hanne, Helgaker, Trygve, Hennum, Alf Christian, Hettema, Hinne, Hjertenaes, Eirik, Høst, Stinne, Høyvik, Ida-Marie, Iozzi, Maria Francesca, Jansík, Branislav, Jensen, Hans Jørgen Aa., Jonsson, Dan, Jørgensen, Poul, Kauczor, Joanna, Kirpekar, Sheela, Kjaergaard, Thomas, Klopper, Wim, Knecht, Stefan, Kobayashi, Rika, Koch, Henrik, Kongsted, Jacob, Krapp, Andreas, Kristensen, Kasper, Ligabue, Andrea, Lutnaes, Ola B., Melo, Juan I., Mikkelsen, Kurt V., Myhre, Rolf H., Neiss, Christian, Nielsen, Christian B., Norman, Patrick, Olsen, Jeppe, Olsen, Jógvan Magnus H., Osted, Anders, Packer, Martin J., Pawlowski, Filip, Pedersen, Thomas B., Provasi, Patricio F., Reine, Simen, Rinkevicius, Zilvinas, Ruden, Torgeir A., Ruud, Kenneth, Rybkin, Vladimir V., Sałek, Pawel, Samson, Claire C. M., de Merás, Alfredo Sánchez, Saue, Trond, Sauer, Stephan P. A., Schimmelpfennig, Bernd, Sneskov, Kristian, Steindal, Arnfinn H., Sylvester-Hvid, Kristian O., Taylor, Peter R., Teale, Andrew M., Tellgren, Erik I., Tew, David P., Thorvaldsen, Andreas J., Thøgersen, Lea, Vahtras, Olav, Watson, Mark A., Wilson, David J. D., Ziolkowski, Marcin, Ågren, Hans

    Published 2013
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