Front Cover; Solid State Physics, Volume 20; Copyright Page; Contents; Contributors to Volume 20; Preface; Contents of Previous Volumes; Supplementary Monographs; Articles to Appear Shortly; Chapter 1. Determination of Electron Distribution in Crystals by Means of X Rays; I. Introduction; II. Theoretical Background; III. Determination of the Degree of Ionization by Different Methods; IV. Difference Fourier Synthesis; Chapter 2. Electronic Effects in the Elastic Properties of Semiconductors; I. Introduction; II. Phenomenological Description of Elastic Constants.

III. Effect of Free Electrons on Elastic PropertiesIV. Electronic Strain; V. Electrons on Donors; VI. Conclusion; Chapter 3. The Jahn-Teller Effect in Solids; I. Introduction; II. The John-Teller Effect in Doubly Degenerate Electronic States; III. The John-Teller Effect in Triply Degenerate States; IV. Optical Transitions Involving Jahn-Teller Distorted States; Chapter 4. Green's Function Method in Lattice Dynamics; Introduction; I. Dynamics of Lattice Vibrations; II. Phonon Correlation Function and Experimental Observables; III. Phonon Green's Function.

IV. Explicit Calculation of Phonon Green's Function and ApplicationsV. Phonon Boltzmann Equation; VI. Coupled Phonon-Photon System; Chapter 5. Helical Spin Ordering-1 Theory of Helical Spin Configurations; Introduction; I. Elementary Theory of Helical Spin Ordering; II. Spin Waves in the Screw Structure; III. Effect of Anisotropy Energy on Spin Configurations; IV. Effect of External Field on Spin Configurations; V. Spin Waves in Various Configurations in an Applied Field; VI. Complex Spin Configurations; VII. Spin Configurations in Spinel Lattice.

VIII. Neel Temperature and Spin Ordering for Complex LatticesIX. Neutron Diffraction: Theory and Examples; Appendix; Author Index; Subject Index.