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{{Infobox software
{{Infobox software
| logo =
| logo =
| name = PSI4
| name = Psi4
| developer = The PSI4 Project
| developer = The Psi4 Project
| operating_system = [[Linux]]、[[Microsoft Windows]]、[[macOS|Mac OS X]]
| operating_system = [[Linux]]、[[Microsoft Windows]]、[[macOS|Mac OS X]]
| latest release version = PSI4 1.1
| latest release version = Psi4 1.1
| latest release date = {{Start date and age|2017|5|19}}
| latest release date = {{Start date and age|2017|5|19}}
| programming language = [[C++]]、[[Python (programming language)|Python]]
| programming language = [[C++]]、[[Python (programming language)|Python]]
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| website = http://www.psicode.org
| website = http://www.psicode.org
}}
}}
'''PSI''' is an [[Ab initio quantum chemistry methods|ab initio]] [[computational chemistry]] package originally written by the research group of [[Henry F. Schaefer, III]] ([[University of Georgia]]). Utilizing PSI, one can perform a calculation on a [[molecular]] system with various kinds of calculation method such as [[Hartree-Fock method]], [[Post-Hartree–Fock]] methods and [[Density functional theory]].<ref name=Homepage /><ref name="PirhadiSunseri2016" /> Structure optimization and frequency calculation are implemented in the program as well as energy calculation.<ref name=Homepage /><ref name="PirhadiSunseri2016" /> The major part of the program is written in [[C++]], while [[Python (programming language)|Python]] [[API]] is also available, which allows the users to configure in detail or to automatize the calculation process.<ref name=Homepage /><ref name="TurneySimmonett2012"/>
'''Psi''' is an [[Ab initio quantum chemistry methods|ab initio]] [[computational chemistry]] package originally written by the research group of [[Henry F. Schaefer, III]] ([[University of Georgia]]). Utilizing PSI, one can perform a calculation on a [[molecular]] system with various kinds of calculation method such as [[Hartree-Fock method]], [[Post-Hartree–Fock]] methods and [[Density functional theory]].<ref name=Homepage /><ref name="PirhadiSunseri2016" /> The program can compute energies, optimize molecular geometries, and compute vibrational frequencies.<ref name=Homepage /><ref name="PirhadiSunseri2016" /><ref name="ParrishBurns2017" /> The major part of the program is written in [[C++]], while [[Python (programming language)|Python]] [[API]] is also available, which allows the users to configure in detail or to automatize the calculation process.<ref name=Homepage /><ref name="TurneySimmonett2012"/><ref name="ParrishBurns2017" />


'''PSI4''' is the latest release of the program package - it is [[open source]], released as [[free software|free]] under the [[GNU General Public License|GPL]] through [[GitHub]]. Primary development of '''PSI4''' is currently conducted by Daniel Crawford ([[Virginia Tech]]), David Sherrill ([[Georgia Institute of Technology|Georgia Tech]]), Justin Turney ([[University of Georgia]]), and Rollin King ([[Bethel University (Minnesota)|Bethel University]]).<ref name=Homepage /><ref name="TurneySimmonett2012"/><ref name="ParrishBurns2017"/> '''PSI4''' is available on Linux releases such as Fedora and Ubuntu.
'''Psi4''' is the latest release of the program package - it is [[open source]], released as [[free software|free]] under the [[GNU General Public License|GPL]] through [[GitHub]]. Primary development of '''Psi4''' is currently performed by the research groups of C. David Sherrill ([[Georgia Institute of Technology|Georgia Tech]]), T. Daniel Crawford ([[Virginia Tech]]), Francesco Evangelista ([[Emory University]]), and [[Henry F. Schaefer, III]] ([[University of Georgia]]), with substantial contributions by Justin Turney ([[University of Georgia]]), Andy Simmonett ([[NIH]]), and Rollin King ([[Bethel University (Minnesota)|Bethel University]]).<ref name=Homepage /><ref name="TurneySimmonett2012"/><ref name="ParrishBurns2017"/> '''PSI4''' is available on Linux releases such as Fedora and Ubuntu.


==Features==
==Features==


The basic capabilities of PSI are concentrated around the following methods<ref name=Homepage /> of [[quantum chemistry]]:
The basic capabilities of Psi are concentrated around the following methods<ref name=Homepage /> of [[quantum chemistry]]:


* [[Hartree–Fock method]]
* [[Hartree–Fock method]]
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* [[symmetry-adapted perturbation theory]]
* [[symmetry-adapted perturbation theory]]


Several methods are available for computing excited electronic states, including [[Configuration interaction|configuration interaction singles]] (CIS), the [[random phase approximation]] (RPA), and equation-of-motion coupled cluster (EOM-CCSD). PSI also includes the explicitly-correlated MP2-R12 method and the ability to compute the [[diagonal Born–Oppenheimer correction]] (DBOC) using [[configuration interaction]] [[wave function]]s.<ref name=Homepage />
Several methods are available for computing excited electronic states, including [[Configuration interaction|configuration interaction singles]] (CIS), the [[random phase approximation]] (RPA), and equation-of-motion coupled cluster (EOM-CCSD).<ref name=Homepage />

Psi4 has introduced the density-fitting approximation in many portions of the code, leading to faster computations and reduced I/O requirements.<ref name=Homepage /><ref name="TurneySimmonett2012"/><ref name="ParrishBurns2017" />


==See also==
==See also==
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==External links==
==External links==
*[http://www.psicode.org PSI4 Homepage]
*[http://www.psicode.org Psi4 Homepage]
*[https://github.com/psi4/psi4 PSI4 Source Code (GitHub)]
*[https://github.com/psi4/psi4 Psi4 Source Code (GitHub)]


{{DEFAULTSORT:Psi (Computational Chemistry)}}
{{DEFAULTSORT:Psi (Computational Chemistry)}}

Revision as of 01:28, 8 April 2018

Psi4
Developer(s)The Psi4 Project
Stable release
Psi4 1.1 / May 19, 2017; 7 years ago (2017-05-19)
Repository
Written inC++Python
Operating systemLinuxMicrosoft WindowsMac OS X
TypeComputational chemistry
LicenseGPL
Websitehttp://www.psicode.org

Psi is an ab initio computational chemistry package originally written by the research group of Henry F. Schaefer, III (University of Georgia). Utilizing PSI, one can perform a calculation on a molecular system with various kinds of calculation method such as Hartree-Fock method, Post-Hartree–Fock methods and Density functional theory.[1][2] The program can compute energies, optimize molecular geometries, and compute vibrational frequencies.[1][2][3] The major part of the program is written in C++, while Python API is also available, which allows the users to configure in detail or to automatize the calculation process.[1][4][3]

Psi4 is the latest release of the program package - it is open source, released as free under the GPL through GitHub. Primary development of Psi4 is currently performed by the research groups of C. David Sherrill (Georgia Tech), T. Daniel Crawford (Virginia Tech), Francesco Evangelista (Emory University), and Henry F. Schaefer, III (University of Georgia), with substantial contributions by Justin Turney (University of Georgia), Andy Simmonett (NIH), and Rollin King (Bethel University).[1][4][3] PSI4 is available on Linux releases such as Fedora and Ubuntu.

Features

The basic capabilities of Psi are concentrated around the following methods[1] of quantum chemistry:

Several methods are available for computing excited electronic states, including configuration interaction singles (CIS), the random phase approximation (RPA), and equation-of-motion coupled cluster (EOM-CCSD).[1]

Psi4 has introduced the density-fitting approximation in many portions of the code, leading to faster computations and reduced I/O requirements.[1][4][3]

See also

References

  1. ^ a b c d e f g "Psi4: OPEN-SOURCE QUANTUM CHEMISTRY". The PSI4 Project. Retrieved 2017-07-06.
  2. ^ a b Pirhadi, Somayeh; Sunseri, Jocelyn; Koes, David Ryan (2016). "Open source molecular modeling". Journal of Molecular Graphics and Modelling. 69: 127–143. doi:10.1016/j.jmgm.2016.07.008. ISSN 1093-3263.
  3. ^ a b c d Parrish, Robert M.; Burns, Lori A.; Smith, Daniel G. A.; Simmonett, Andrew C.; DePrince, A. Eugene; Hohenstein, Edward G.; Bozkaya, Uğur; Sokolov, Alexander Yu.; Di Remigio, Roberto; Richard, Ryan M.; Gonthier, Jérôme F.; James, Andrew M.; McAlexander, Harley R.; Kumar, Ashutosh; Saitow, Masaaki; Wang, Xiao; Pritchard, Benjamin P.; Verma, Prakash; Schaefer, Henry F.; Patkowski, Konrad; King, Rollin A.; Valeev, Edward F.; Evangelista, Francesco A.; Turney, Justin M.; Crawford, T. Daniel; Sherrill, C. David (2017). "Psi4 1.1: An Open-Source Electronic Structure Program Emphasizing Automation, Advanced Libraries, and Interoperability". Journal of Chemical Theory and Computation. doi:10.1021/acs.jctc.7b00174. ISSN 1549-9618.
  4. ^ a b c Turney, Justin M.; Simmonett, Andrew C.; Parrish, Robert M.; Hohenstein, Edward G.; Evangelista, Francesco A.; Fermann, Justin T.; Mintz, Benjamin J.; Burns, Lori A.; Wilke, Jeremiah J.; Abrams, Micah L.; Russ, Nicholas J.; Leininger, Matthew L.; Janssen, Curtis L.; Seidl, Edward T.; Allen, Wesley D.; Schaefer, Henry F.; King, Rollin A.; Valeev, Edward F.; Sherrill, C. David; Crawford, T. Daniel (2012). "Psi4: an open-sourceab initioelectronic structure program". Wiley Interdisciplinary Reviews: Computational Molecular Science. 2 (4): 556–565. doi:10.1002/wcms.93. ISSN 1759-0876.