As a formulation for calculating the dynamic polarizabilities and hyperpolarizabilities, two different types of the time-dependent Møller᎐Plesset Ž . perturbation theory MPPT are presented: the MPPT in the quasienergy derivative Ž . Ž . method QED᎐MPPT and the MPPT in the energylike derivative metho
Møller-Plesset perturbation theory with the AUHF wavefunction
✍ Scribed by J. Baker
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 486 KB
- Volume
- 152
- Category
- Article
- ISSN
- 0009-2614
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## Abstract Based on a partitioning of the total correlation energy into contributions from parallel‐ and antiparallel‐spin pairs of electrons, a modified third‐order Møller–Plesset (MP) perturbation theory is developed. The method, termed SCS–MP3 (SCS for spin‐component‐scaled) continues previous
## Abstract A new perturbation approach is proposed that enhances the low‐order, perturbative convergence by modifying the zeroth‐order Hamiltonian in a manner that enlarges any small‐energy denominators that may otherwise appear in the perturbative expansion. This intruder state avoidance (ISA) me
Single-reference closed-shell Møller᎐Plesset perturbation theory is well known for its size consistency, a quality that is essential for consistent comparisons of calculations on molecules of different size. However, it is far from obvious whether this quality can be retained in the multireference c
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