Green’s functions in quantum chemistry I. The Σ perturbation method |
| |
Authors: | K L Sebastian |
| |
Institution: | (1) Department of Chemistry, Calicut University, 673 635 Calicut |
| |
Abstract: | As an improvement over the Hartree-Fock approximation, we investigate a Green’s Function method—theΣ perturbation method—for molecular calculations. The method is applied to hydrogen molecule and to theπ-electron system of ethylene under PPP approximation. When the algebraic approximation is used, the energy obtained is better
than that of the HF approach, but is not as good as that of the configuration-interaction method. The main advantage of this
procedure is that it is devoid of the most serious defect of HF method, viz. incorrect dissociation limits. |
| |
Keywords: | Green’ s functions hydrogen molecule ethylene molecule perturbation method |
本文献已被 SpringerLink 等数据库收录! |
|