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Titlebook: Many-Electron Densities and Reduced Density Matrices; Jerzy Cioslowski Book 2000 Springer Science+Business Media New York 2000 Atom.Schröd

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书目名称Many-Electron Densities and Reduced Density Matrices
编辑Jerzy Cioslowski
视频video
丛书名称Mathematical and Computational Chemistry
图书封面Titlebook: Many-Electron Densities and Reduced Density Matrices;  Jerzy Cioslowski Book 2000 Springer Science+Business Media New York 2000 Atom.Schröd
描述Science advances by leaps and bounds rather than linearly in time. I t is not uncommon for a new concept or approach to generate a lot of initial interest, only to enter a quiet period of years or decades and then suddenly reemerge as the focus of new exciting investigations. This is certainly the case of the reduced density matrices (a k a N-matrices or RDMs), whose promise of a great simplification of quantum-chemical approaches faded away when the prospects of formulating the auxil­ iary yet essential N-representability conditions turned quite bleak. How­ ever, even during the period that followed this initial disappointment, the 2-matrices and their one-particle counterparts have been ubiquitous in the formalisms of modern electronic structure theory, entering the correlated-level expressions for the first-order response properties, giv­ ing rise to natural spinorbitals employed in the configuration interaction method and in rigorous analysis of electronic wavefunctions, and al­ lowing direct calculations of ionization potentials through the extended Koopmans‘theorem. The recent research of Nakatsuji, Valdemoro, and Mazziotti her­ alds a renaissance of the concept of RDlvls tha
出版日期Book 2000
关键词Atom; Schrödinger equation; chemical physics; density; density functional theory; development; electron; il
版次1
doihttps://doi.org/10.1007/978-1-4615-4211-7
isbn_softcover978-1-4613-6890-8
isbn_ebook978-1-4615-4211-7Series ISSN 1568-217X
issn_series 1568-217X
copyrightSpringer Science+Business Media New York 2000
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Density Equation Theory in Chemical Physics.,σ.) is used here and in the following]. The SE is a determinative equation of the wave function ψ and the Pauli principle imposes an anti-symmetric constraint on ψ The wave function depends on all the N electron coordinates of the system, while the Hamiltonian, is the sum of the one- and two-elect
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Cumulants and the Contracted Schrödinger Equationt observables. Because the interactions between electrons are pairwise within the Hamiltonian, the energy may be determined exactly through a knowledge of the two-particle reduced density matrix (2-RDM) [., .]. Unlike the unknown dependence of the energy on the one-particle density in density functi
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Natural Orbital Functional Theoryion of electronic correlation. The most accurate methods available today, e.g. the configuration interaction (CI) method [.] or the coupled cluster (CC) method [.], are computationally too expensive to be applied to large systems. Quantum Monte Carlo approaches [.] require considerable human input a
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The Pair Density in Approximate Density Functionals: The Hidden Agentshown to lead naturally to the local density approximation for exchange and correlation. The rigorous basis for this approach is exact density functional theory [., .–.]. We review recent advances from a pair density perspective.
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Functional N-representability in Density Matrix and Density Functional Theory: An Illustration for Hrators) [.–.]. The cases for p = 1 and p = 2 corresponding to the reduced 1- and 2-matrices, respectively, have been of particular importance in this theory. The latter still lacks a complete solution, although much progress has been accomplished in setting up several N-representability conditions [
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Intracule and Extracule Densities: Historical Perspectives and Future Prospectsmputer codes that constitute contemporary electronic structure methods. The earliest studies of electron-pair densities focused on the relative motion of two electrons and aimed at gaining insights into the physical consequences of electron correlation. More recently, the balance has shifted in the
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Topology of Electron Correlationber and the location of critical points (the points at which the gradient of a function vanishes), and their mutual relationships are often directly related to the properties of the system under study. For example, topological analysis of the potential energy as a function of nuclear positions permi
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