In this article, a modification of a procedure proposed by Zirrilli et al. for solving nonlinear equations is presented. The method permits the computation of minima and saddle points of energy functionals. The Muller-Brown test potential and the quantum chemical description of some proton transfer
HF-HCl: stationary points on the scf energy hypersurface and thermodynamics of formation
✍ Scribed by P. Hobza; M.M. Szczȩśniak; Z. Latajka
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 362 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Three statronary points on the SCF 4-31G energy hypersurface of HF-HCI were e\arnined. Two of them are real rnuurna mrrespondmg to HF HCl and HCI HF quasthnear structures. The thud one, a cychc structure, 1s a saddle pomt. The role of the basts-set superposttron error and of drspersron energy 1s dtscussed for all stationary pomts. The process leadmg to the forrnatton of the stable roomer HF HCI 1s entropy controlled.
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The determination of minima and saddle points on the potential energy surfaces of the hydrogen bonded species 02-HF and 0,-H20 is performed with unrestricted Hartree-Fock calculations. Geometries, electron density distributions, and relative energies for every stationary point are reported. Only one
A method is presented, in the context of MC-SCF theory, for the optimization of the lowest energy point of a conical intersection of two potential energy surfaces that does not require the use of Berry's phase condition. The technique uses existing methodology of quantum chemistry (analytical gradie