Editing Gaussian (software) (section)

==Standard abilities==
According to the most recent Gaussian manual, the package can do:<ref>{{cite web|url=http://www.gaussian.com/g_tech/g09ur.htm|title=Gaussian online manual|access-date=2010-06-15|archive-date=2016-11-22|archive-url=https://web.archive.org/web/20161122023351/http://www.gaussian.com/g_tech/g09ur.htm|url-status=dead}}</ref>
*[[Molecular mechanics]]
**[[AMBER]]
**[[Universal force field]] (UFF)
**DREIDING force field
*[[Semi-empirical quantum chemistry method]] calculations
**[[Austin Model 1]] (AM1),<ref>{{cite journal |title= Development and use of quantum molecular models. 75. Comparative tests of theoretical procedures for studying chemical reactions|author1=Michael J. S. Dewar |author2=Eve G. Zoebisch |author3=Eamonn F. Healy |author4=James J. P. Stewart |journal= Journal of the American Chemical Society |volume= 107 |issue=19 |pages= 3902–3909 |year= 1985 |doi= 10.1021/ja00299a024}}</ref> [[PM3 (chemistry)|PM3]],<ref>{{cite journal |title= Optimization of parameters for semiempirical methods I. Method |author= James J. P. Stewart |journal= Journal of Computational Chemistry |volume= 10 |issue= 2 |pages= 209–220 |year= 1989 |doi= 10.1002/jcc.540100208|citeseerx= 10.1.1.457.684 }}</ref> [[CNDO/2|CNDO]], [[INDO]], [[MINDO]]/3, [[MNDO]]
*[[Self-consistent field]] (SCF methods)
**[[Hartree–Fock method]]: restricted, [[Unrestricted Hartree–Fock|unrestricted]], and [[Restricted open-shell Hartree–Fock|restricted open-shell]]
*[[Møller–Plesset perturbation theory]] (MP2,<ref>{{cite journal |title= Note on an Approximation Treatment form Many-Electron Systems |journal= Physical Review |volume= 46 |issue=7 |pages= 618–622 |year= 1934 |doi= 10.1103/PhysRev.46.618 |author1=C. Møller |author2=M. S. Plesset |bibcode=1934PhRv...46..618M|url= https://authors.library.caltech.edu/1753/1/MOLpr34.pdf }}</ref> MP3, MP4, MP5).
*Built-in [[density functional theory]] (DFT) methods
**B3LYP and other [[hybrid functional]]s
**Exchange functionals: PBE, MPW, PW91, Slater, X-alpha, Gill96, TPSS.
**Correlation functionals: PBE, TPSS, VWN,<ref>{{cite journal |last= Vosko |first= S.H. |author2=L. Wilk |author3=M. Nusair| title= Accurate spin-dependent electron liquid correlation energies for local spin density calculations: a critical analysis |journal= Canadian Journal of Physics |volume= 58 |pages= 1200–1211 |year= 1980 |doi= 10.1139/p80-159 |bibcode=1980CaJPh..58.1200V |issue= 8|url= http://www.escholarship.org/uc/item/23j4q7zm |doi-access= free }}</ref> PW91, LYP, PL, P86, B95
*[[ONIOM]] ([[QM/MM]] method) up to three layers
*[[Complete active space]] (CAS) and [[multi-configurational self-consistent field]] calculations
*[[Coupled cluster]] calculations
*[[Quadratic configuration interaction]] (QCI) methods
*[[Quantum chemistry composite methods]] – CBS-QB3, CBS-4, CBS-Q, CBS-Q/APNO, G1, G2, G3, W1 high-accuracy methods