𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Orbital optimization techniques: Comparative study in a semiempirical framework

✍ 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

No coin nor oath required. For personal study only.

✦ Synopsis


Abstract

In this paper, MC‐SCF and CI methods have been explored for the calculation of ground‐ and excited‐state energies of some aromatic heterocycles in the PPP framework. A new algorithm for solving the orbital equations in MC‐SCF 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.


πŸ“œ SIMILAR VOLUMES


Gradients for configuration interaction
✍ Giovanni Granucci; Maurizio Persico πŸ“‚ Article πŸ“… 2011 πŸ› John Wiley and Sons 🌐 English βš– 182 KB

## 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 spin‐orbit coupling. We show how to proceed in the simplest case where all the wavefunctions belonging to the CI su

Molecular inversion in the nΟ€* states: A
✍ Manas Banerjee; Sankar Prasad Bhattacharyya πŸ“‚ Article πŸ“… 1982 πŸ› John Wiley and Sons 🌐 English βš– 410 KB

## 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

A technique for orbital exponent optimiz
✍ G. M. Loubriel; R. G. Selsby πŸ“‚ Article πŸ“… 1974 πŸ› John Wiley and Sons 🌐 English βš– 497 KB

## 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