Hartree-Fock instabilities are investigated for about 80 compounds, from acetylene to mivazerol (27 atoms) and a cluster of 18 water molecules, within a double ฮถ basis set. For most conjugated systems, the restricted Hartree-Fock wave function of the singlet fundamental state presents an external or
The continuity dilemma and hartree-fock instabilities
โ Scribed by N. Moiseyev; J. Katriel
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 403 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
The stability criteria of the Hartree-Fock wavefunctions YC implemented in the context of the Raothaan-Ha&e-e-Fock procedure. Use is made of modified SCF equations, in which the total enera, rather than orbital energies, appezxs. The procedure is applied to the 2 'S state of helium.
๐ SIMILAR VOLUMES
The Hartree-Fock instabilities of S2N2 are reported and compared with those of S3N3 and S4Ng'. These unsaturated sulfur nitrogen planar rings are P electron rich and although the symmetry adapted HF solutions are singlet stable at the experimental bond lengths they become unstable with only a very m
We present a study of the instability and convergence of Hartree-Fock (HF) ab initio solutions for the diatomic systems H 2 , LiH, CH, C 2 , and N 2 . In our study, we consider real molecular orbitals (MOs) and analyze the classes of single-determinant functions associated to Hartree-Fock-Roothaan (
The traditional description of pseudo-JahnแTeller molecular configuration instability based on Bader's formula for the curvature of the adiabatic potential is reconsidered in order to make it consistent with straightforward calculations of the ground-state energy surface within HartreeแFockแRoothaan
language used: ALGOL 60 particle model, electronic structure, atomic models, wave functions, off-diagonal energy parameters, frozen core High speed storage required: 32 k (approximation), ground state, excited state, single-electron state, discrete state, continuous state, single-configuration No. o