2023

• Williams, David M. G.; Kjønstad, Eirik Fadum; Martínez, Todd J.. (2023) Geometric phase in coupled cluster theory. Journal of Chemical Physics
  Vitenskapelig artikkel
• Kjønstad, Eirik Fadum; Koch, Henrik. (2023) Communication: Non-adiabatic derivative coupling elements for the coupled cluster singles and doubles model. Journal of Chemical Physics
  Vitenskapelig artikkel

2022

• Schnack-Petersen, Anna Kristina; Koch, Henrik; Coriani, Sonia; Kjønstad, Eirik Fadum. (2022) Efficient implementation of molecular CCSD gradients with Cholesky-decomposed electron repulsion integrals. Journal of Chemical Physics
  Vitenskapelig artikkel

2021

• Goletto, Linda; Kjønstad, Eirik Fadum; Folkestad, Sarai D.; Høyvik, Ida-Marie; Koch, Henrik. (2021) Linear-Scaling Implementation of Multilevel Hartree-Fock Theory. Journal of Chemical Theory and Computation
  Vitenskapelig artikkel
• Gulania, Sahil; Kjønstad, Eirik Fadum; Stanton, John F.; Koch, Henrik; Krylov, Anna I.. (2021) Equation-of-motion coupled-cluster method with double electron-attaching operators: Theory, implementation, and benchmarks. Journal of Chemical Physics
  Vitenskapelig artikkel
• Folkestad, Sarai Dery; Kjønstad, Eirik Fadum; Goletto, Linda; Koch, Henrik. (2021) Multilevel CC2 and CCSD in Reduced Orbital Spaces: Electronic Excitations in Large Molecular Systems. Journal of Chemical Theory and Computation
  Vitenskapelig artikkel

2020

• Kjønstad, Eirik Fadum; Folkestad, Sarai Dery; Koch, Henrik. (2020) Accelerated multimodel Newton-type algorithms for faster convergence of ground and excited state coupled cluster equations. Journal of Chemical Physics
  Vitenskapelig artikkel
• Kjønstad, Eirik Fadum; Koch, Henrik. (2020) Biorthonormal Formalism for Nonadiabatic Coupled Cluster Dynamics. Journal of Chemical Theory and Computation
  Vitenskapelig artikkel
• Haugland, Tor S.; Enrico, Ronca; Kjønstad, Eirik Fadum; Rubio, Angel; Koch, Henrik. (2020) Coupled Cluster Theory for Molecular Polaritons: Changing Ground and Excited States. Physical Review X
  Vitenskapelig artikkel
• Folkestad, Sarai Dery; Kjønstad, Eirik Fadum; Myhre, Rolf Heilemann; Andersen, Josefine; Balbi, Alice; Coriani, Sonia. (2020) eT 1.0: An open source electronic structure program with emphasis on coupled cluster and multilevel methods. Journal of Chemical Physics
  Vitenskapelig artikkel

2019

• Folkestad, Sarai Dery; Kjønstad, Eirik Fadum; Koch, Henrik. (2019) An efficient algorithm for Cholesky decomposition of electron repulsion integrals. Journal of Chemical Physics
  Vitenskapelig artikkel
• Kjønstad, Eirik Fadum; Koch, Henrik. (2019) An Orbital Invariant Similarity Constrained Coupled Cluster Model. Journal of Chemical Theory and Computation
  Vitenskapelig artikkel
• Faber, Rasmus; Kjønstad, Eirik Fadum; Koch, Henrik; Coriani, Sonia. (2019) Spin adapted implementation of EOM-CCSD for triplet excited states: Probing intersystem crossings of acetylacetone at the carbon and oxygen K-edges. Journal of Chemical Physics
  Vitenskapelig artikkel

2017

• Kjønstad, Eirik Fadum; Heilemann Myhre, Rolf; Martinez, Todd J.; Koch, Henrik. (2017) Crossing conditions in coupled cluster theory. Journal of Chemical Physics
  Vitenskapelig artikkel
• Kjønstad, Eirik Fadum; Koch, Henrik. (2017) Resolving the Notorious Case of Conical Intersections for Coupled Cluster Dynamics. The Journal of Physical Chemistry Letters
  Vitenskapelig artikkel

2016

• Kjønstad, Eirik; Koch, Henrik. (2016) Symmetric Coupled Cluster Theory. NTNU
  Mastergradsoppgave