✦ LIBER ✦
Coupled perturbation theory within the antisymmetrized product of separated geminals (APSG) framework
✍ Scribed by Yu. Dmitriev; G. Peinel
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 319 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0020-7608
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
A coupled perturbation theory for the antisymmetrized product of separated geminals (APSG) approximation is derived. The variational principle for the APSG wave function in an external oscillating field is employed and a set of equations of the form analogous to the normal RPA is obtained. At this level the reduced resolvent in the form of a spectral expansion is written and it is used for the evaluation of the second‐order properties.