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Open AccessJournal ArticleDOI

Note on an Approximation Treatment for Many-Electron Systems

Chr. Møller, +1 more
- 01 Oct 1934 - 
- Vol. 46, Iss: 7, pp 618-622
TLDR
In this article, a perturbation theory for treating a system of n electrons in which the Hartree-Fock solution appears as the zero-order approximation was developed, and it was shown by this development that the first order correction for the energy and the charge density of the system is zero.
Abstract
A perturbation theory is developed for treating a system of n electrons in which the Hartree-Fock solution appears as the zero-order approximation. It is shown by this development that the first order correction for the energy and the charge density of the system is zero. The expression for the second-order correction for the energy greatly simplifies because of the special property of the zero-order solution. It is pointed out that the development of the higher approximation involves only calculations based on a definite one-body problem.

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Benchmark Databases for Nonbonded Interactions and Their Use To Test Density Functional Theory

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PRIRODA-04: a quantum-chemical program suite. New possibilities in the study of molecular systems with the application of parallel computing

TL;DR: The PRIRODA program suite as discussed by the authors is designed for the study of complex molecular systems by density functional theory, at the MP2, MP3, and MP4 levels of multiparticle perturbation theory, and by the coupled-cluster single and double excitations method (CCSD) with the application of parallel computing.
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DFTB3: Extension of the self-consistent-charge density-functional tight-binding method (SCC-DFTB).

TL;DR: The present study combines earlier extensions and improves them consistently with, first, an improved Coulomb interaction between atomic partial charges, and second, the complete third-order expansion of the DFT total energy, leading to the next generation of theDFTB methodology called DFTB3, which substantially improves the description of charged systems containing elements C, H, N, O, and P.
Journal ArticleDOI

Møller–Plesset theory for atomic ground state energies

TL;DR: In this paper, the Hartree-Fock (UHF) Hamiltonian is used as the unperturbed system and the technique is described as unrestricted Mo-Plesset to second order (UMP2).
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CO2 Capture and Separations Using MOFs: Computational and Experimental Studies

TL;DR: This Review focuses on research oriented toward elucidation of the various aspects that determine adsorption of CO2 in metal-organic frameworks and its separation from gas mixtures found in industrial processes.
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