Open-Source Quantum Chemistry – an electronic structure package in C++ driven by Python

676
357
C++

Status Azure DevOps builds Codecov coverage
Latest Release Last release tag Commits since release python
Communication User site docs latest chat on forum dev chat on slack
Foundation license platforms python
Installation obtain latest Conda Anaconda-Server Badge
Demo Binder

Psi4 is an open-source suite of ab initio quantum chemistry programs
designed for efficient, high-accuracy simulations of
molecular properties. We routinely perform computations with >2500 basis functions on multi-core machines.

With computationally demanding portions written in C++, exports
of many C++ classes into Python via Pybind11, and a flexible Python driver, Psi4
strives to be friendly to both users and developers.

License license

Psi4: an open-source quantum chemistry software package

Copyright © 2007-2024 The Psi4 Developers.

The copyrights for code used from other parties are included in
the corresponding files.

Psi4 is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, version 3.

Psi4 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with Psi4; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

The full text of the GNU Lesser General Public License (version 3) is included in the
COPYING.LESSER file of this repository, and can also be found
here.

Citation doi

The journal article reference describing Psi4 is:

D. G. A. Smith, L. A. Burns, A. C. Simmonett, R. M. Parrish,
M. C. Schieber, R. Galvelis, P. Kraus, H. Kruse, R. Di Remigio,
A. Alenaizan, A. M. James, S. Lehtola, J. P. Misiewicz, M. Scheurer,
R. A. Shaw, J. B. Schriber, Y. Xie, Z. L. Glick, D. A. Sirianni,
J. S. O’Brien, J. M. Waldrop, A. Kumar, E. G. Hohenstein,
B. P. Pritchard, B. R. Brooks, H. F. Schaefer III, A. Yu. Sokolov,
K. Patkowski, A. E. DePrince III, U. Bozkaya, R. A. King,
F. A. Evangelista, J. M. Turney, T. D. Crawford, C. D. Sherrill,
“Psi4 1.4: Open-Source Software for High-Throughput Quantum Chemistry”,
J. Chem. Phys. 152(18) 184108 (2020).

  • doi for Psi4 v1.1
  • doi for Psi4NumPy
  • doi for Psi4 alpha releases
  • doi for Psi3