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The investigation of scattering phenomena is a major theme of
modern physics. A scattered particle provides a dynamical probe of
the target system. The practical problem of interest here is the
scattering of a low energy electron by an N-electron atom. It has
been difficult in this area of study to achieve theoretical results
that are even qualitatively correct, yet quantitative accuracy is
often needed as an adjunct to experiment. The present book
describes a quantitative theoretical method, or class of methods,
that has been applied effectively to this problem. Quantum
mechanical theory relevant to the scattering of an electron by an
N-electron atom, which may gain or lose energy in the process, is
summarized in Chapter 1. The variational theory itself is presented
in Chapter 2, both as currently used and in forms that may
facilitate future applications. The theory of multichannel
resonance and threshold effects, which provide a rich structure to
observed electron-atom scattering data, is presented in Chapter 3.
Practical details of the computational implementation of the
variational theory are given in Chapter 4. Chapters 5 and 6
summarize recent appli cations of the variational theory to
problems of experimental interest, with many examples of the
successful interpretation of complex structural fea tures observed
in scattering experiments, and of the quantitative prediction of
details of electron-atom scattering phenomena."
This book brings together the essential ideas and methods behind
applications of variational theory in theoretical physics and
chemistry. The emphasis is on understanding physical and
computational applications of variational methodology rather than
on rigorous mathematical formalism. The text begins with an
historical survey of familiar variational principles in classical
mechanics and optimization theory, then proceeds to develop the
variational principles and formalism behind current computational
methodology for bound and continuum quantum states of interacting
electrons in atoms, molecules, and condensed matter. It covers
multiple-scattering theory, including a detailed presentation of
contemporary methodology for electron-impact rotational and
vibrational excitation of molecules. The book ends with an
introduction to the variational theory of relativistic fields.
Ideal for graduate students and researchers in any field that uses
variational methodology, this book is particularly suitable as a
backup reference for lecture courses in mathematical methods in
physics and theoretical chemistry.
This book consolidates and brings up to date the variational theory and methods currently used in many branches of theoretical physics and chemistry. The text surveys essential ideas and methods, concentrating on theory as used in applications rather than on fine points of rigorous mathematics. Essential concepts are developed in a common notation and from a uniform critical point of view. Examples of important applications are reviewed in sufficient detail to provide the reader with a critical understanding of context and methodology.
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