Reprint of a work first published by McGraw-Hill Publishing Company, New York, in 1990. Written for upper-level undergraduates or beginning graduate students, this introduction to quantum chemistry describes the origins of quantum theory and outlines the application of quantum mechanics to simple systems. It also discusses the Schr÷dinger wave equation and its approximate solutions, the Hartree-Fock self-consistent field method, and semi-empirical molecular orbital methods. Electron spin, the quantum states of atoms, the algebra of many-electron calculations, molecular structure, and electronic structure are also covered. Appendices offer expositions of related mathematical and physical material. Annotation c. Book News, Inc., Portland, OR (booknews.com)