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000015675 1001_ $$0P:(DE-HGF)0$$aLischka, H.$$b0
000015675 245__ $$aColumbus - a program system for advanced multireference theory calculations
000015675 260__ $$c2011
000015675 300__ $$a191 - 199
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000015675 440_0 $$024141$$aWiley Interdisciplinary Reviews: Computational Molecular Science$$v1$$y2
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000015675 520__ $$aThe COLUMBUS Program System allows high-level quantum chemical calculations based on the multiconfiguration self-consistent field, multireference configuration interaction with singles and doubles, and the multireference averaged quadratic coupled cluster methods. The latter method includes size-consistency corrections at the multireference level. Nonrelativistic (NR) and spin-orbit calculations are available within multireference configuration interaction (MRCI). A prominent feature of COLUMBUS is the availability of analytic energy gradients and nonadiabatic coupling vectors for NR MRCI. This feature allows efficient optimization of stationary points and surface crossings (minima on the crossing seam). Typical applications are systematic surveys of energy surfaces in ground and excited states including bond breaking. Wave functions of practically any sophistication can be constructed limited primarily by the size of the CI expansion rather than by its complexity. A massively parallel CI step allows state-of-the art calculations with up to several billion configurations. Electrostatic embedding of point charges into the molecular Hamiltonian gives access to quantum mechanical/molecular mechanics calculations for all wave functions available in COLUMBUS. The analytic gradient modules allow on-the-fly nonadiabatic photodynamical simulations of interesting chemical and biological problems. Thus, COLUMBUS provides a wide range of highly sophisticated tools with which a large variety of interesting quantum chemical problems can be studied. (C) 2011 John Wiley & Sons, Ltd. WIREs Comput Mol Sci 2011 1 191-199 DOI: 10.1002/wcms.25
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000015675 7001_ $$0P:(DE-Juel1)132204$$aMüller, Th.$$b1$$uFZJ
000015675 7001_ $$0P:(DE-HGF)0$$aSzalay, P.G.$$b2
000015675 7001_ $$0P:(DE-HGF)0$$aShavitt, I.$$b3
000015675 7001_ $$0P:(DE-HGF)0$$aPitzer, R.M.$$b4
000015675 7001_ $$0P:(DE-HGF)0$$aShepard, R.$$b5
000015675 773__ $$0PERI:(DE-600)2599565-0$$a10.1002/wcms.25$$gVol. 1, p. 191 - 199$$p191 - 199$$q1<191 - 199$$tWiley Interdisciplinary Reviews: Computational Molecular Science$$v1$$y2011
000015675 8567_ $$uhttp://dx.doi.org/10.1002/wcms.25
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