Springer Tracts in Modern Physics 81: Point Defects in Metals I: Introduction to the Theory. This book provides a comprehensive introduction to the theory of point defects in metals. It covers the basic concepts and methods of lattice dynamics, including harmonic approximation, linear response, and Green's functions. The book also discusses the physics of point defects in metals, which is different from that of semiconductors and insulators. It explains how the defect structure in metals is simple, in contrast to the variety of charged and excited states in atomic defects in semiconductors or insulators. The book also discusses the use of elastic strain fields and lattice waves to study the mechanical properties of crystals, as well as the use of X-ray and neutron scattering to determine the static structure of defects and the changes of lattice modes. The book also covers the Mössbauer effect, which can provide information about the vibrational and migrational behavior of defects. The book is written in a clear and accessible manner, with many illustrations and examples to aid understanding. It is intended for graduate students and researchers in the field of solid-state physics. The book is dedicated to the memory of Günther Leibfried, a scientist and educator who made significant contributions to the field of lattice theory and its applications. The book is part of the Springer Tracts in Modern Physics series, which is a collection of volumes that present the results of research in modern physics. The book is accompanied by a detailed subject index and references to further reading. The book is written by N. Breuer and G. Leibfried, and it is the first volume in a series on point defects in metals. The second volume, Point Defects in Metals II: Atomic Structures and Vibrational Behaviour, is also part of this series. The book is a valuable resource for anyone interested in the study of point defects in metals and their effects on the mechanical properties of crystals.Springer Tracts in Modern Physics 81: Point Defects in Metals I: Introduction to the Theory. This book provides a comprehensive introduction to the theory of point defects in metals. It covers the basic concepts and methods of lattice dynamics, including harmonic approximation, linear response, and Green's functions. The book also discusses the physics of point defects in metals, which is different from that of semiconductors and insulators. It explains how the defect structure in metals is simple, in contrast to the variety of charged and excited states in atomic defects in semiconductors or insulators. The book also discusses the use of elastic strain fields and lattice waves to study the mechanical properties of crystals, as well as the use of X-ray and neutron scattering to determine the static structure of defects and the changes of lattice modes. The book also covers the Mössbauer effect, which can provide information about the vibrational and migrational behavior of defects. The book is written in a clear and accessible manner, with many illustrations and examples to aid understanding. It is intended for graduate students and researchers in the field of solid-state physics. The book is dedicated to the memory of Günther Leibfried, a scientist and educator who made significant contributions to the field of lattice theory and its applications. The book is part of the Springer Tracts in Modern Physics series, which is a collection of volumes that present the results of research in modern physics. The book is accompanied by a detailed subject index and references to further reading. The book is written by N. Breuer and G. Leibfried, and it is the first volume in a series on point defects in metals. The second volume, Point Defects in Metals II: Atomic Structures and Vibrational Behaviour, is also part of this series. The book is a valuable resource for anyone interested in the study of point defects in metals and their effects on the mechanical properties of crystals.