The second-order multireference perturbation theory employing multiple partitioning of the many-electron Hamiltonian into a zero-order part and a perturbation is formulated in terms of many-body diagrams. The essential difference from the standard diagrammatic technique of Hose and Kaldor concerns t
Spin-adapted multipartitioning perturbation theory
✍ Scribed by Andréi Zaitsevskii; Jean-Paul Malrieu
- Publisher
- Springer
- Year
- 1997
- Tongue
- English
- Weight
- 431 KB
- Volume
- 96
- Category
- Article
- ISSN
- 1432-2234
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📜 SIMILAR VOLUMES
A perturbation theory appropriate for low-spin open-shell systems introduced by Murray and Davidson is investigated at second order. Matrix formulas are given and applications to NH, OH+, Oz. CH2 and H&O are reported. The results suggest that this perturbation theory is eauivalent in accuracy to tho
## Abstract The spin 1/2 Heisenberg ferromagnet is treated by perturbation theory. To avoid the difficulties connected with the unusual commutation relations of spin operators the Dyson‐Maleev transformation is applied. The corresponding Bose system is described by the Bose‐Green function. To calcu