Use of noncanonical orbitals in many-body perturbation theory
β Scribed by Keith McDowell
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 441 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0020-7608
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
A formalism for dealing with noncanonical HartreeβFock spin orbitals is presented within the framework of manyβbody perturbation theory. A test calculation on the planar methyl radical is carried out which displays certain features of openβshell calculations and which demonstrates the viability of using noncanonical spin orbitals. Results are found to be in good agreement with a previous configuration interaction calculation.
π SIMILAR VOLUMES
Although the physical significance of Kohn-Sham orbitals is only given by the ground state density of the Kohn-Sham quasi-particle system they nevertheless form a single-particle system, which may serve as a basis for perturbation theory or variational methods. Rayleigh-SchrSdinger perturbation seri
Formulas for calculating NMR chemical shifts at second-order many-body perturbation theory using the gauge-including atomic orbital method are presented and their implementation is discussed. The method is applied to study correlation effects on calculated ~70 chemical shifts,