World's Best Scientists 2026 revealed!
Trygve Helgaker

Trygve Helgaker

Award Badge
Chemistry
Norway
2026

D-Index & Metrics

Chemistry

D-Index
102
Citations
42847
World Ranking
1144
National Ranking
1

Research.com Recognitions

  • 2026 - Research.com Chemistry in Norway Leader Award
  • 2025 - Research.com Chemistry in Norway Leader Award
  • 2022 - Research.com Chemistry in Norway Leader Award
  • 2007 - Centenary Prize, Royal Society of Chemistry (UK)

Overview

Trygve Helgaker is a researcher primarily affiliated with the University of Oslo in Norway. Their academic work spans the field of Physics and Astronomy, with a concentration on Atomic and Molecular Physics, and Optics. Additional subfields include Spectroscopy, Statistical and Nonlinear Physics, Physical and Theoretical Chemistry, and Materials Chemistry.

Their research topics cover a broad range of advanced and specialized areas such as:

  • Advanced Chemical Physics Studies
  • Spectroscopy and Quantum Chemical Studies
  • Quantum, superfluid, helium dynamics
  • Cold Atom Physics and Bose-Einstein Condensates
  • Molecular Spectroscopy and Structure
  • Machine Learning in Materials Science
  • Catalysis and Oxidation Reactions

Trygve Helgaker has published extensively, with a significant number of works appearing in key scientific venues, including:

  • The Journal of Chemical Physics (10 publications)
  • arXiv (Cornell University) (10 publications)
  • Molecular Physics (5 publications)
  • Faraday Discussions (4 publications)
  • Physical Chemistry Chemical Physics (2 publications)

Among notable recent papers are:

  • "DFT exchange: sharing perspectives on the workhorse of quantum chemistry and materials science" (2022), Physical Chemistry Chemical Physics
  • "Dalton Project: A Python platform for molecular- and electronic-structure simulations of complex systems" (2020), The Journal of Chemical Physics
  • "Analyzing Magnetically Induced Currents in Molecular Systems Using Current-Density-Functional Theory" (2020), The Journal of Physical Chemistry A
  • "Atoms and molecules in soft confinement potentials" (2020), Molecular Physics
  • "Analytic calculation of the Berry curvature and diagonal Born-Oppenheimer correction for molecular systems in uniform magnetic fields" (2022), The Journal of Chemical Physics

Trygve Helgaker collaborates frequently with other researchers, including:

  • Erik I. Tellgren (19 joint works)
  • Laurens D. M. Peters (14 joint works)
  • Tanner Culpitt (11 joint works)
  • Andrew M. Teale (9 joint works)
  • Andre Laestadius (6 joint works)

They received the Centenary Prize from the Royal Society of Chemistry (UK) in 2007.

Best Publications

  • Molecular Electronic-Structure Theory: Helgaker/Molecular Electronic-Structure Theory

    Trygve Helgaker;Poul Jørgensen;Jeppe Olsen

  • Basis-set convergence of correlated calculations on water

    Trygve Helgaker;Wim Klopper;Henrik Koch;Jozef Noga

  • Basis-set convergence in correlated calculations on Ne, N2, and H2O

    Asger Halkier;Trygve Helgaker;Poul Jørgensen;Wim Klopper

  • Ab Initio Methods for the Calculation of NMR Shielding and Indirect Spin-Spin Coupling Constants

    Trygve Helgaker;Michał Jaszuński;Kenneth Ruud

  • Excitation energies in density functional theory : an evaluation and a diagnostic test.

    Michael J. G. Peach;Peter Benfield;Trygve Helgaker;David J. Tozer

  • The Dalton quantum chemistry program system

    Kestutis Aidas;Celestino Angeli;Keld L. Bak;Vebjørn Bakken

  • Basis-set convergence of the energy in molecular Hartree–Fock calculations

    Asger Halkier;Trygve Helgaker;Poul Jørgensen;Wim Klopper

  • Recent advances in wave function-based methods of molecular-property calculations.

    Trygve Helgaker;Sonia Coriani;Poul Jørgensen;Kasper Kristensen

  • Excitation energies from the coupled cluster singles and doubles linear response function (CCSDLR). Applications to Be, CH+, CO, and H2O

    Henrik Koch;Hans Jørgen Aa. Jensen;Poul Jørgensen;Trygve Helgaker

  • Dalton, a molecular electronic structure program

    H. Agren;David John. Wilson;O. Vahtras;P. R. Taylor

  • The CC3 model: An iterative coupled cluster approach including connected triples

    Henrik Koch;Ove Christiansen;Poul Jørgensen;Alfrede M. Sanchez De Merás

  • Assessment of a Coulomb-attenuated exchange-correlation energy functional.

    Michael J. G. Peach;Trygve Helgaker;Paweł Sałek;Thomas W. Keal

  • Basis set convergence of the interaction energy of hydrogen-bonded complexes

    Asger Halkier;Wim Klopper;Trygve Helgaker;Poul Jo

  • Analytical calculation of nuclear magnetic resonance indirect spin–spin coupling constants at the generalized gradient approximation and hybrid levels of density-functional theory

    Trygve Helgaker;Mark Watson;Nicholas C. Handy

  • Density-functional theory of linear and nonlinear time-dependent molecular properties

    Paweł Sałek;Olav Vahtras;Trygve Helgaker;Hans Ågren

  • The prediction of molecular equilibrium structures by the standard electronic wave functions

    Trygve Helgaker;Jürgen Gauss;Poul Jørgensen;Jeppe Olsen

  • The accurate determination of molecular equilibrium structures

    Keld L. Bak;Jürgen Gauss;Poul Jørgensen;Jeppe Olsen

  • An electronic Hamiltonian for origin independent calculations of magnetic properties

    Trygve Helgaker;Poul Jo;rgensen

  • The quantum-chemical calculation of NMR indirect spin-spin coupling constants

    Trygve Helgaker;Michał Jaszuński;Magdalena Pecul

  • Mo/ller–Plesset energy derivatives

    Poul Jo;rgensen;Trygve Helgaker

Frequent Co-Authors

Kenneth Ruud
Kenneth Ruud University of Tromsø - The Arctic University of Norway
Poul Jørgensen
Poul Jørgensen Aarhus University
Jeppe Olsen
Jeppe Olsen Aarhus University
Wim Klopper
Wim Klopper Karlsruhe Institute of Technology
Sonia Coriani
Sonia Coriani Technical University of Denmark
Henrik Koch
Henrik Koch Scuola Normale Superiore di Pisa
Poul Jo
Poul Jo Aarhus University
Hans Ågren
Hans Ågren Uppsala University
Kurt V. Mikkelsen
Kurt V. Mikkelsen University of Copenhagen
Ove Christiansen
Ove Christiansen Aarhus University

If you think any of the details on this page are incorrect, let us know.

Report an issue

We appreciate your kind effort to assist us to improve this page, it would be helpful providing us with as much detail as possible in the text box below:

Related Online Degrees & Career Pathways

Studying Chemistry in the USA opens doors to various career opportunities, many of which can be pursued through specialized online degrees. For those interested in legal support roles within the chemical or pharmaceutical industries, exploring different types of degrees for paralegals can be a strategic starting point. These programs provide essential knowledge that bridges law and science, preparing graduates for compliance and regulatory roles.

If you are drawn to the business side of chemistry-related products, a career as a pharmaceutical sales representative might be ideal. Understanding the pharmaceutical sales salary potential and requirements can help you gauge the career's viability and growth.

For those aiming for clinical roles, becoming a pharmacist is a rigorous yet rewarding path. It is important to know how long does it take to become a pharmacist, as the journey involves extensive education and licensing but offers a stable and respected profession.

Additionally, chemistry graduates interested in forensic science might consider roles such as medical examiner assistants. Learning how to become a medical examiner assistant can guide you through the education and job outlook for this specialized career path.

Best Scientists Citing Trygve Helgaker

Trending Scientists

Recently Published Articles