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.
Users' Website www.psicode.org
Downloading and Installing Psi4 https://psicode.org/psi4manual/master/build_faq.html (for the CMake adept, see CMakeLists.txt
Tutorial https://psicode.org/psi4manual/master/tutorial.html for Psithon (
psi4 job.in), https://psicode.org/psi4manual/master/psiapi.html for PsiAPI (
Communication & Support https://psicode.org/psi4manual/master/introduction.html#technical-support
Github https://github.com/psi4/psi4 (authoritative repository)
Sample Inputs http://www.psicode.org/psi4manual/master/testsuite.html (also in
Download Tarball https://github.com/psi4/psi4/releases
Psi4: an open-source quantum chemistry software package
Copyright (c) 2007-2021 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.
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).