A study is made of the general Hartree-Fock (GHF) method, in which the basic spin-orbitals may be mixtures of functions having (Y andp spins. The existence of the solutions to the GHF equations has been proven by Lieb and Simon, and the nature of the various types of solutions has been group theoret
Some formal comments on spin projected hartree—fock theory
✍ Scribed by John J. Sullivan
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 318 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0020-7608
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📜 SIMILAR VOLUMES
## Abstract Recent progress in multiconfiguration time‐dependent Hartree–Fock (MC–TDHF) theory is reviewed. The generality of a formalism first put forward by Moccia [Int. J. Quantum Chemistry **8**, 293 (1974)] is emphasized, and illustrative applications are discussed. A calculation of the freque
Curve crossing in a simple two-electron two-orbital model is considered. It is shown that the spin density wave (SDIi? solution has the correct crossing points and is closest to the exact solution of ali single determinants.
A new open-shell perturbation theory is formulated in terms of symmetric spin orbitals. Only one set of spatial orbitals is required, thereby reducing the number of independent coeffmients in the perturbed wavefunctions. For second order, the computational cost is shown to be similar to a closed-she