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Physical Chemistry Chemical Physics : PCCP|August 23, 2007
A unified scheme for the calculation of differentiated and undifferentiated molecular integrals over solid-harmonic GaussiansSimen Reine, Erik Tellgren, Trygve HelgakerJournal of Computational Chemistry|February 3, 2007
Electron correlation: the many-body problem at the heart of chemistryDavid P Tew, Wim Klopper, Trygve HelgakerPhysical Chemistry Chemical Physics : PCCP|June 25, 2009
Non-perturbative magnetic phenomena in closed-shell paramagnetic moleculesErik I Tellgren, Trygve Helgaker, Alessandro SonciniThe Journal of Chemical Physics|July 20, 2006
A second-quantization framework for the unified treatment of relativistic and nonrelativistic molecular perturbations by response theoryTrygve Helgaker, Alf Christian Hennum, Wim KlopperJournal of Computational Chemistry|March 23, 2002
Software news and updates. Basis-set completeness profiles in two dimensionsAlexander A Auer, Trygve Helgaker, Wim KlopperJournal of Computational Chemistry|May 25, 2013
Internal-to-Cartesian back transformation of molecular geometry steps using high-order geometric derivativesVladimir V Rybkin, Ulf Ekström, Trygve HelgakerThe Journal of Chemical Physics|December 3, 2008
Nonperturbative ab initio calculations in strong magnetic fields using London orbitalsErik I Tellgren, Alessandro Soncini, Trygve HelgakerThe Journal of Physical Chemistry. A|March 4, 2011
Influence of external force on properties and reactivity of disulfide bondsMaria Francesca Iozzi, Trygve Helgaker, Einar UggerudChemical Communications (Cambridge, England)|October 10, 2006
The intramolecular beta-fluorine...ammonium interaction in 4- and 8-membered ringsNatalie E J Gooseman, David O'Hagan, Alexandra M Z Slawin, et al.The Journal of Physical Chemistry. A|December 16, 2005
Quadratic response functions in a second-order polarization propagator frameworkJeppe Olsen, Poul Jørgensen, Trygve Helgaker, et al.Pageof 18