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
Dynamic hyperpolarizabilities in Møller–Plesset perturbation theory
✍ Scribed by Motoyuki Shiga; Fumihiko Aiga; Kotoku Sasagane
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 279 KB
- Volume
- 71
- Category
- Article
- ISSN
- 0020-7608
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✦ Synopsis
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 method ELD᎐MPPT . The explicit expressions for the response properties in each of these MPPT up to the w Ž . Ž . x quadratic response , ␣ y , ,  y , , at an arbitrary correlated order are 1 1 1 2
given. Calculations of the dynamic polarizabilities and hyperpolarizabilities dependent Ž . Ž . on one frequency at the second-order MPPT MP2 , in the QED method QED᎐MP2 and Ž . in the ELD method ELD᎐MP2 , are examined for 10-electron systems: hydrogen fluoride and neon.
📜 SIMILAR VOLUMES
Multireference perturbation theory is examined in connection with the two partitions in the Merller-Plesset and Epstein-Nesbet schemes. The implementation of an efficient diagrammatic technique is described and two examples of application (diazene and the Cr, molecule), involving large variational s
We extended the dynamic response theory in the Møller᎐Plesset Ž . Ž . perturbation theory MPPT based on the quasi-energy derivative QED method for closed-shell systems to that for open-shell systems. In this study we perform the Ž . calculations of frequency-dependent polarizabilities ␣ y; for nonde
The Kramers' restricted Hartree᎐Fock KRHF and second-order Ž . Møller᎐Plesset perturbation KRMP2 methods using relativistic effective core potentials Ž . RECP with spin᎐orbit operators and two-component spinors are extended to the unrestricted forms, KUHF and KUMP2. As in the conventional unrestrict