xpressions are derived for matrix elements of Et he Hamiltonian operator for spin-coupled wave functions in molecular systems having an even number of electrons. Orthogonality of spatial orbitals is not assumed, and the coupling scheme can be specified at will. Relations to other methods are noted b
Origins of coupled cluster technique for atoms and molecules
✍ Scribed by Jiří Čížek
- Publisher
- Springer
- Year
- 1991
- Tongue
- English
- Weight
- 255 KB
- Volume
- 80
- Category
- Article
- ISSN
- 1432-2234
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📜 SIMILAR VOLUMES
## Abstract Electron correlation effect in conjugated polymer is a long‐standing problem, especially for the nonlinear optical properties. We have implemented a spin‐adapted Coupled Cluster with singles and doubles excitation with local molecular orbital approach. As a first application, we evaluat
The relativistic coupled cluster method is applied to SnH4. Starting from Dirac-Fock four-component spinors, correlation is incorporated at the second-order perturbation theory and coupled cluster singles and doubles levels. Eighteen electrons are correlated to include any core polarization effects.