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'''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]]). It performs high-accuracy quantum computations on small to medium-sized [[molecule]]s.
'''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]] [[API]] is also available, which allows the users to configure in detail or to automatize the calculation process.<ref name=Homepage /><ref name="TurneySimmonett2012"/>


'''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>Justin M. Turney, Andrew C. Simmonett, Robert M. Parrish, Edward G. Hohenstein, Francesco A. Evangelista, Justin T. Fermann, Benjamin J. Mintz, Lori A. Burns, Jeremiah J. Wilke, Micah L. Abrams, Nicholas J. Russ, Matthew L. Leininger, Curtis L. Janssen, Edward T. Seidl, Wesley D. Allen, Henry F. Schaefer, Rollin A. King, Edward F. Valeev, C. David Sherrill, T. Daniel Crawford. Wiley Interdisciplinary Reviews: Computational Molecular Science, Vol 2 Issue 4, pages 556–565., 2012. DOI: 10.1002/wcms.93.</ref> '''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 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.


==Features==
==Features==


The basic capabilities of PSI are concentrated around the following methods 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]]
* [[Density functional theory]]
* [[Møller–Plesset perturbation theory]]
* [[Coupled cluster]]
* [[Coupled cluster]]
* [[Multi-configurational self-consistent field#Complete active space SCF|CASSCF]]
* [[Multi-configurational self-consistent field#Complete active space SCF|CASSCF]]
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* symmetry adapted perturbation methods.
* symmetry adapted perturbation methods.


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). PSI3 also includes the explicitly-correlated MP2-R12 method and the ability to compute the [[Born–Oppenheimer diagonal correction]] using [[configuration interaction]] [[wave function]]s.
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). PSI3 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 />


==See also==
==See also==
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==References==
==References==
{{Reflist}}
{{Reflist|refs=
<ref name=Homepage>{{cite web|url=http://www.psicode.org/|publisher=The PSI4 Project|title=Psi4: OPEN-SOURCE QUANTUM CHEMISTRY|accessdate=2017-07-06}}</ref>
<ref name="PirhadiSunseri2016">{{cite journal|last1=Pirhadi|first1=Somayeh|last2=Sunseri|first2=Jocelyn|last3=Koes|first3=David Ryan|title=Open source molecular modeling|journal=Journal of Molecular Graphics and Modelling|volume=69|year=2016|pages=127–143|issn=10933263|doi=10.1016/j.jmgm.2016.07.008}}</ref>
<ref name="TurneySimmonett2012">{{cite journal|last1=Turney|first1=Justin M.|last2=Simmonett|first2=Andrew C.|last3=Parrish|first3=Robert M.|last4=Hohenstein|first4=Edward G.|last5=Evangelista|first5=Francesco A.|last6=Fermann|first6=Justin T.|last7=Mintz|first7=Benjamin J.|last8=Burns|first8=Lori A.|last9=Wilke|first9=Jeremiah J.|last10=Abrams|first10=Micah L.|last11=Russ|first11=Nicholas J.|last12=Leininger|first12=Matthew L.|last13=Janssen|first13=Curtis L.|last14=Seidl|first14=Edward T.|last15=Allen|first15=Wesley D.|last16=Schaefer|first16=Henry F.|last17=King|first17=Rollin A.|last18=Valeev|first18=Edward F.|last19=Sherrill|first19=C. David|last20=Crawford|first20=T. Daniel|title=Psi4: an open-sourceab initioelectronic structure program|journal=Wiley Interdisciplinary Reviews: Computational Molecular Science|volume=2|issue=4|year=2012|pages=556–565|issn=17590876|doi=10.1002/wcms.93}}</ref>
<ref name="ParrishBurns2017">{{cite journal|last1=Parrish|first1=Robert M.|last2=Burns|first2=Lori A.|last3=Smith|first3=Daniel G. A.|last4=Simmonett|first4=Andrew C.|last5=DePrince|first5=A. Eugene|last6=Hohenstein|first6=Edward G.|last7=Bozkaya|first7=Uğur|last8=Sokolov|first8=Alexander Yu.|last9=Di Remigio|first9=Roberto|last10=Richard|first10=Ryan M.|last11=Gonthier|first11=Jérôme F.|last12=James|first12=Andrew M.|last13=McAlexander|first13=Harley R.|last14=Kumar|first14=Ashutosh|last15=Saitow|first15=Masaaki|last16=Wang|first16=Xiao|last17=Pritchard|first17=Benjamin P.|last18=Verma|first18=Prakash|last19=Schaefer|first19=Henry F.|last20=Patkowski|first20=Konrad|last21=King|first21=Rollin A.|last22=Valeev|first22=Edward F.|last23=Evangelista|first23=Francesco A.|last24=Turney|first24=Justin M.|last25=Crawford|first25=T. Daniel|last26=Sherrill|first26=C. David|title=Psi4 1.1: An Open-Source Electronic Structure Program Emphasizing Automation, Advanced Libraries, and Interoperability|journal=Journal of Chemical Theory and Computation|year=2017|issn=1549-9618|doi=10.1021/acs.jctc.7b00174}}</ref>
}}


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


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

Revision as of 19:23, 10 August 2017

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] Structure optimization and frequency calculation are implemented in the program as well as energy calculation.[1][2] 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][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 conducted by Daniel Crawford (Virginia Tech), David Sherrill (Georgia Tech), Justin Turney (University of Georgia), and Rollin King (Bethel University).[1][3][4] 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). PSI3 also includes the explicitly-correlated MP2-R12 method and the ability to compute the diagonal Born–Oppenheimer correction (DBOC) using configuration interaction wave functions.[1]

See also

References

  1. ^ a b c d e f "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 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.
  4. ^ 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.


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