PSI4 1.1 Paper!
Our latest paper, PSI4 1.1: An Open-Source Electronic Structure Program Emphasizing Automation, Advanced Libraries, and Interoperability, is available under the Just Accepted Manuscripts section of the Journal of Chemical Theory and Computation
Recent PSI4 News
A PSI4 Users' Workshop was held at the ACS Florida Meeting and Exposition on May 4, 2017 read more
PSI4 Code Updates
What is PSI4?
PSI4 is an open-source suite of ab initio quantum chemistry programs designed for efficient, high-accuracy simulations of a variety of molecular properties. We can routinely perform computations with more than 2500 basis functions running serially or in parallel.
Development of Psi and associated projects has been supported in part by the U.S. National Science Foundation under Awards ACI-1609842, CHE-1566192, ACI-1449723, ACI-1450169, CHE-1300497, ACI-1147843.