A revision of a successful junior/senior level text, this introduction to elementary quantum mechanics clearly explains the properties of the most important quantum systems. Emphasizes the applications of theory, and contains new material on particle physics, electron-positron annihilation in solids and the Mossbauer effect. Includes new appendices on such topics as crystallography, Fourier Integral Description of a Wave Group, and Time-Independent Perturbation Theory. Table of Contents Thermal Radiation and Planck's Postulate. Photons--Particlelike Properties of Radiation. De Broglie's Postulate--Wavelike Properties of Particles. Bohr's Model of the Atom. Schroedinger's Theory of Quantum Mechanics. Solutions of Time-Independent Schroedinger Equations. One-Electron Atoms. Magnetic Dipole Moments, Spin, and Transition Rates. Multielectron Atoms--Ground States and X-Ray Excitations. Multielectron Atoms--Optical Excitations. Quantum Statistics. Molecules. Solids--Conductors and Semiconductors. Solids--Superconductors and Magnetic Properties. Nuclear Models. Nuclear Decay and Nuclear Reactions. Introduction to Elementary Particles. More Elementary Particles. Appendixes.