eT 1.0: An open source electronic structure program with emphasis on coupled cluster and multilevel methods

Sarai D. Folkestad, Eirik F. Kjønstad, Rolf H. Myhre, Josefine Hvarregaard Andersen, Alice Balbi, Sonia Coriani, Tommaso Giovannini, Linda Goletto, Tor S. Haugland, Anders Hutcheson, Ida-Marie Høyvik, Torsha Moitra, Alexander C. Paul, Marco Scavino, Andreas S. Skeidsvoll, Åsmund H. Tveten, Henrik Koch*

*Corresponding author for this work

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Abstract

The eT program is an open source electronic structure package with emphasis on coupled cluster and multilevel methods. It includes efficient spin adapted implementations of ground and excited singlet states, as well as equation of motion oscillator strengths, for CCS, CC2, CCSD, and CC3. Furthermore, eT provides unique capabilities such as multilevel Hartree–Fock and multilevel CC2, real-time propagation for CCS and CCSD, and efficient CC3 oscillator strengths. With a coupled cluster code based on an efficient Cholesky decomposition algorithm for the electronic repulsion integrals, eT has similar advantages as codes using density fitting, but with strict error control. Here, we present the main features of the program and demonstrate its performance through example calculations. Because of its availability, performance, and unique capabilities, we expect eT to become a valuable resource to the electronic structure community.
Original languageEnglish
Article number184103
JournalJournal of Chemical Physics
Volume152
Issue number18
ISSN0021-9606
DOIs
Publication statusPublished - 2020

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