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Titlebook: Structure and Dynamics of Atoms and Molecules: Conceptual Trends; J. L. Calais,E. S. Kryachko Book 1995 Springer Science+Business Media Do

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书目名称Structure and Dynamics of Atoms and Molecules: Conceptual Trends
编辑J. L. Calais,E. S. Kryachko
视频video
图书封面Titlebook: Structure and Dynamics of Atoms and Molecules: Conceptual Trends;  J. L. Calais,E. S. Kryachko Book 1995 Springer Science+Business Media Do
描述The rivers run into the sea, yet the sea is not full Ecclesiastes What is quantum chemistry? The straightforward answer is that it is what quan­ tum chemists do. But it must be admitted, that in contrast to physicists and chemists, "quantum chemists" seem to be a rather ill-defined category of scientists. Quantum chemists are more or less physicists (basically theoreticians), more or less chemists, and by and large, computationists. But first and foremost, we, quantum chemists, are conscious beings. We may safely guess that quantum chemistry was one of the first areas in the natural sciences to lie on the boundaries of many disciplines. We may certainly claim that quantum chemists were the first to use computers for really large scale calculations. The scope of the problems which quantum chemistry wishes to answer and which, by its unique nature, only quantum chemistry can answer is growing daily. Retrospectively we may guess that many of those problems meet a daily need, or are say, technical in some sense. The rest are fundamental or conceptual. The daily life of most quantum chemists is usually filled with grasping the more or less technical problems. But it is at least as impor
出版日期Book 1995
关键词Absorption; Atom; Sorption; molecule; quantum chemistry; quantum theory; structure
版次1
doihttps://doi.org/10.1007/978-94-011-0263-6
isbn_softcover978-94-010-4116-4
isbn_ebook978-94-011-0263-6
copyrightSpringer Science+Business Media Dordrecht 1995
The information of publication is updating

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Quantum Dynamics of Diatoms in External Fields,ic coupling between the states. The latter application involves multiple electronic states and the introduction of a quasi-diabatic basis. In each instance we use ab initio or experimentally determined potentials and dipoles.
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Dimensional Scaling in Quantum Theory,so that extrapolation and interpolation of properties as a function of . becomes possible. Wave functions and energies at the physical dimension, . = 3, are found using a perturbation series based on the parameter 1/ ., and by interpolation between exactly-known solutions at . = 1 and . = ∞.
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The Work Formalism: A new Theory of Electronic Structure,ectron correlations in the approximate wavefunction is improved, as in going from the Hartree to Hartree-Fock to the Configuration-Interaction approximations, the energy too is improved. In each case a rigorous upper bound to the exact non-relativistic value is obtained, the bound improving with the wavefunction.
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Building A Bridge Between AB Initio and Semiempirical Theories of Molecular Electronic Structure, in the capabilities of ab initio electronic structure methods for accurately describing molecular electronic structure. Thus, ab initio electronic structure computer “packages” are now available to the general scientific community, and their usage is in a rapid stage of growth. While there is a con
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