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Developer(s) Computing for Science Ltd.
CCLRC Daresbury Laboratory
Initial release 1981; 36 years ago (1981)
Stable release
7.0 / 1 January 2010; 7 years ago (2010-01-01)
Development status Active
Written in C, Fortran
Operating system Linux, Mac OS X, AIX, Tru64 UNIX; Windows
Platform x86, x86-64, PowerPC, MIPS, SPARC, Alpha
Available in English
Type Computational chemistry
License Proprietary: freeware in UK; demo, serial, parallel, site-wide, joint software development

General Atomic and Molecular Electronic Structure System (GAMESS-UK) is a computer software program for computational chemistry. The original code split in 1981 into GAMESS-UK and GAMESS (US) variants, which now differ significantly. Many of the early developments in the UK version arose from the earlier UK based ATMOL program, which, unlike GAMESS, lacked analytical gradients for geometry optimisation.

GAMESS-UK can perform many general computational chemistry calculations, including Hartree–Fock method, Møller–Plesset perturbation theory (MP2 & MP3), coupled cluster (CCSD & CCSD(T)), density functional theory (DFT), configuration interaction (CI), and other advanced electronic structure methods. Calculation of valence bond wave functions are possible by the TURTLE code, due to J. H. van Lenthe.

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