## Abstract We present a method for the analytical evaluation of the molecular energy gradient for a semiempirical configuration interaction (CI) wavefunction, taking into account the spinβorbit coupling. We show how to proceed in the simplest case where all the wavefunctions belonging to the CI su
Orbital optimization techniques: Comparative study in a semiempirical framework
β Scribed by S. S. Z. Adnan; S. Bhattacharya; D. Mukherjee
- Book ID
- 104579358
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- English
- Weight
- 454 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0020-7608
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β¦ Synopsis
Abstract
In this paper, MCβSCF and CI methods have been explored for the calculation of groundβ and excitedβstate energies of some aromatic heterocycles in the PPP framework. A new algorithm for solving the orbital equations in MCβSCF theory has been suggested and its performance has been compared with the conventional gradient optimization technique. Energies of first few transitions have been calculated and compared with rather extensive CI results.
π SIMILAR VOLUMES
## Abstract The considerations of Walsh rules are extended to rationalize the loss of planarity in the ^1,3^__n__Ο\* states of simple carbonyl and thiocarbonyl molecules. The role of Fermi correlation in shaping the differences between conformations in the singlet and the triplet state is emphasize
## Abstract A technique for Slater orbital exponent optimization in an HFο£ΏSCFο£ΏLCAOο£ΏMO calculation is proposed in which orbital exponent variation is incorporated into the SCF scheme. This is accomplished by rewriting Slater's rules so that the shielding terms depend on the molecular charge distribu