A note on hartree-fock instability
✍ Scribed by J. Nyberg
- Book ID
- 110660220
- Publisher
- Società Italiana di Fisica
- Year
- 1969
- Weight
- 102 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0375-930X
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📜 SIMILAR VOLUMES
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 ζ basis set. For most conjugated systems, the restricted Hartree-Fock wave function of the singlet fundamental state presents an external or
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.
## Abstract The conditions for instability of solutions of Hartree–Fock and projected Hartree–Fock equations are derived in a form involving finite real symmetric matrices. These conditions are also expressed in terms of the Fock–Dirac density matrix, both at the spin–orbital and at the orbital lev