A consistent use of the spectral representation is made to develop an effective Hamiltonian for molecular calculations in which only active electrons are dealt with, keeping other electrons frozen. The effective Hamiltonian is prepared without invoking any parameter fitting and adjusting procedures.
Valence effective Hamiltonian method for molecular fragments
β Scribed by Ronald E. Hammer; Kenneth M. Sando
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 456 KB
- Volume
- 142
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The valence effective Hamiltonian method has been applied to the calculation of the electronic structures of molecular fragments. With increasing fragment size, charge densities and isolated orbital energies rapidly converge to those determined from a full molecule calculation.
π SIMILAR VOLUMES
The ab initio effective valence shell Hamiltonian method, which is based upon quasidegenerate many-body perturbation theory, has been extended to calculate molecular properties. This new method is applied to the study of dipole moment functions of the OH molecule and its ions. The calculated results
The ab initio effective valence shell Hamiltonian method, based on quasi-degenerate many-body perturbation theory, is generalized to calculate molecular properties as well as the valence state energies. The procedure requires the evaluation of effective operators for each molecular property. Effecti