O
Ove Christiansen
Researcher at Aarhus University
Publications - 219
Citations - 16424
Ove Christiansen is an academic researcher from Aarhus University. The author has contributed to research in topics: Coupled cluster & Excited state. The author has an hindex of 65, co-authored 219 publications receiving 15329 citations. Previous affiliations of Ove Christiansen include University of Copenhagen & Lund University.
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The second-order approximate coupled cluster singles and doubles model CC2
TL;DR: In this article, an approximate coupled cluster singles and doubles model is presented, denoted CC2, where the total energy is of second-order Moller-Plesset perturbation theory (MP2) quality.
Journal ArticleDOI
The Dalton quantum chemistry program system
Kestutis Aidas,Celestino Angeli,Keld L. Bak,Vebjørn Bakken,Radovan Bast,Linus Boman,Ove Christiansen,Renzo Cimiraglia,Sonja Coriani,Pål Dahle,Erik K. Dalskov,Ulf Ekström,Thomas Enevoldsen,Janus J. Eriksen,Patrick Ettenhuber,Berta Fernández,Lara Ferrighi,Heike Fliegl,Luca Frediani,Kasper Hald,Asger Halkier,Christof Hättig,Hanne Heiberg,Trygve Helgaker,Alf C. Hennum,Hinne Hettema,Eirik Hjertenæs,Stine Høst,Ida-Marie Høyvik,Maria Francesca Iozzi,Brannislav Jansik,Hans-Jørgen Aa. Jensen,Dan Jonsson,Poul Jørgensen,Johanna Kauczor,Sheela Kirpekar,Thomas Kjærgaard,Wim Klopper,Stefan Knecht,Rika Kobayashi,Henrik Koch,Jacob Kongsted,Andreas Krapp,Kasper Kristensen,Andrea Ligabue,Ola B. Lutnæs,Juan Ignacio Melo,Kurt V. Mikkelsen,Rolf H. Myhre,Christian Neiss,Christian B. Nielsen,Patrick Norman,Jeppe Olsen,Jógvan Magnus Haugaard Olsen,Anders Osted,Martin J. Packer,Filip Pawłowski,Thomas Bondo Pedersen,Patricio Federico Provasi,Simen Reine,Zilvinas Rinkevicius,Torgeir A. Ruden,Kenneth Ruud,Vladimir V. Rybkin,Paweł Sałek,Claire C. M. Samson,Alfredo Sánchez de Merás,Trond Saue,Stephan P. A. Sauer,Bernd Schimmelpfennig,Kristian Sneskov,Arnfinn Hykkerud Steindal,Kristian O. Sylvester-Hvid,Peter R. Taylor,Andrew M. Teale,Erik I. Tellgren,David P. Tew,Andreas J. Thorvaldsen,Lea Thøgersen,Olav Vahtras,Mark A. Watson,David J. D. Wilson,Marcin Ziółkowski,Hans Ågren +83 more
TL;DR: Dalton is a powerful general‐purpose program system for the study of molecular electronic structure at the Hartree–Fock, Kohn–Sham, multiconfigurational self‐consistent‐field, Møller–Plesset, configuration‐interaction, and coupled‐cluster levels of theory.
Dalton, a molecular electronic structure program
Hans Ågren,David John. Wilson,Olav Vahtras,Peter R. Taylor,Kristian O. Sylvester-Hvid,Bernd Schimmelpfennig,Stephan P. A. Sauer,Trond Saue,A. M. J. Sanchez de Meras,Paweł Sałek,Kenneth Ruud,Torgeir A. Ruden,Elias Rudberg,Zilvinas Rinkevicius,Thomas Bondo Pedersen,Martin J. Packer,Jeppe Olsen,Patrick Norman,Kurt V. Mikkelsen,Ola B. Lutnæs,Henrik Koch,Rika Kobayashi,Wim Klopper,Sheela Kirpekar,P. Joergensen,D. Jonsson,H. J. Aa. Jensen,Hinne Hettema,Trygve Helgaker,H. Heiberg,Asger Halkier,Kasper Hald,C. Haettig,Berta Fernández,Thomas Enevoldsen,E. K. Dalskov,Pål Dahle,Sonia Coriani,Renzo Cimiraglia,Ove Christiansen,Vebjørn Bakken,Keld L. Bak,Celestino Angeli +42 more
Journal ArticleDOI
Response functions in the CC3 iterative triple excitation model
TL;DR: In this article, the authors derived linear response functions for the approximate coupled cluster singles, doubles, and triples model CC3 and analyzed the excitation energies obtained from the linear response eigenvalue equation in order of the fluctuation potential.
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Response functions from Fourier component variational perturbation theory applied to a time-averaged quasienergy
TL;DR: In this article, it is demonstrated that frequency-dependent response functions can be derived from the time-averaged quasienergy, which plays the same role as the usual energy in time-independent theory, and the same techniques can be used to obtain computationally tractable expressions for response properties, as for energy derivatives in timeindependent theory.