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"Many-body methods for atoms and molecules" addresses two major classes of theories of electron correlation : the many-body perturbation theory and coupled cluster methods. It discusses the issues related to the formal development and consequent numerical implementation of the methods from the standpoint of a practicing theoretician. The book will enable readers to understand the future development of state-of-the-art multi-reference coupled cluster methods as well as their perturbative counterparts.The book begins with an introduction to the issues relevant to the development of correlated methods in general. It next gives a formally rigorous treatment of aspects that pave the foundation toward the theoretical development of methods capable of tackling problems of electronic correlation. The authors go on to cover perturbation theory first in a fundamental way and then in the multi-reference context. They also describe the idea of state-specific theories, Fock space-based multi-reference coupled cluster methods, and basic issues of the single-reference coupled cluster method. The book concludes with state-of-the-art methods of modern electronic structure.

Electron configuration --- Électrons --- Corrélation.

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Electrons --- Électrons. --- Ions --- Ions. --- Électrons.

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Electron donor-acceptor complexes --- Complexes donneur-accepteur d'électrons

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This book offers a new look at the electron. It was the first elementary particle discovered, is probably one of the simplest, and yet is possibly one of the most misunderstood. The author presents here a straightforward classical model that accurately reproduces the main spectroscopic features of the electron, and also its principal quantum aspects. The key to this model is the relativistically spinning sphere, RSS, which has been clamoring for recognition for decades. Although its electrical charge is point-like, the electron itself is Compton-sized, and is composed mainly of non-electromagnetic "mechanical" matter. The bridge between the electron and the other elementary particles is provided by the fine structure constant alpha~1/137, as manifested in the factor-of-137 spacings between the classical electron radius, electron Compton radius, and Bohr orbit radius. An expanded form of the constant alpha leads to equations that define the transformation of electromagnetic energy into electron mass/energy, and, via the electron doorway, to the formation of higher-mass lepton and hadron ground states. An alpha-quantized mass-generation grid extends accurately from the electron all the way to the top quark t, and leads to a corresponding alpha-quantized particle lifetime grid. The mathematics used in these studies is standard, and the calculations are guided by fits to the experimental elementary particle data. This book is written for all scientists who are interested in recent developments in fundamental particle physics.

Electrons. --- Quantum theory. --- Électrons. --- Théorie quantique.

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Electronics. --- Electronique --- Electronics --- Electronique --- Electrons --- Électronique --- Électrons --- Electrons. --- Électronique --- Électrons