The second-order correlation correction to the coupled Hartree-Fock perturbed energies is defined as the f&.t nonvanishing contribution due to perturbation-dependent correlation potential. This correction in fact includes some of higberorder correlation diagrams which appear due to perturbation-indu
Second-order correlation diagrams for hartree-fock functions
โ Scribed by A. N. Ivanova; U. I. Safronova; V. N. Kharitonova
- Book ID
- 112363410
- Publisher
- Springer
- Year
- 1970
- Tongue
- English
- Weight
- 249 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0040-5760
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๐ SIMILAR VOLUMES
a) This term is named in ref. [lo] as E$ll/(l -k) vtith k = E :1 I/&~ll To get the total chemiclll shift one has to add another term. b) cf. ref. [9]. c) Chemical shift of the proton at the innermost hexagon. the ordinary UCHE: theory (with geometric approdmation). In the IUCHF-II method the singJe
## Abstract Different kinds of improved uncoupled HartreeโFock methods are proposed for the calculation of secondโorder perturbation energies. Using these methods inequalities are derived for the error of the uncoupled procedure with geometric approximation.
Explicit spin-orbital equations are presented for the second derivative of the second-order many-body perturbation theory energy based on unrestricted Hartree-Fock reference functions, and their implementation is briefly discussed. Results are reported for the electric polarizabilities, harmonic vib