Includes bibliographical references and index.

"This book provides an introduction to the theory of the four mechanisms - and space charge - starting at a level accessible to those without prior exposure, but who nevertheless are familiar with basic methods in quantum mechanics, statistical mechanics, electricity and magnetism, mathematical methods of the kind that physicists enjoy, and a smattering of other disciplines that a well-rounded graduate curriculum would provide. This introduction will try not to presume too much of the reader, and provide opportunities to either become acquainted with, or refresh one's knowledge of, the physics involved in a way that is, it is hoped, at least interesting and perhaps somewhat different than the usual narratives"-- Provided by publisher