Perspectives of APSG-based multireference perturbation theories
✍ Scribed by Jeszenszki, Péter; Nagy, Péter R.; Zoboki, Tamás; Szabados, Ágnes; Surján, Péter R.
- Book ID
- 125824722
- Publisher
- John Wiley and Sons
- Year
- 2014
- Tongue
- English
- Weight
- 301 KB
- Volume
- 114
- Category
- Article
- ISSN
- 0020-7608
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📜 SIMILAR VOLUMES
We present the formalism for the treatment of several states of the same Ž . symmetry in basis-set reduction BSR , a form of second-order Brillouin᎐Wigner multireference perturbation theory, which incorporates the first-order correction of the primary-space wave function with respect to its orthogon
## 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 obtain