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The application of quantum-mechanical principles to chemical problems has revolutionized the field of chemistry, The knowledge of quantum mechanics is now indispensable to many areas of the physical sciences. Our understanding of chemical bonding, spectral phenomena, molecular reactivities, and other fundamental chemical problems relies on the detailed behavior of electrons in atoms and molecules. Much of applied quantum mechanics is based on the treatment of several model systems such as particle in a box, harmonic oscillator, rigid rotor, barrier penetration, etc. These models are surveyed herein. Many texts in quantum chemistry exist for the advanced student or specialist but there are few good books that provide nonspecialists with the basis of experiments and theories in their fields. This book provides a clear, readable presentation of the basic principles and application of quantum mechanical models for chemists while maintaining a level of mathematical completeness that enables the reader to follow the developments. The second edition features A new chapter on molecular orbital calculations (extended Huckel and self-consistent field) has been included which introduces the basic ideas and terminology. The photoelectric effect, the perturbation treatment of the helium atom, orbital symmetry and chemical reactions, and molecular term symbols are now included. A significant number of additional figures and minor improvements to existing figures and new exercises have been added. Answers are now provided for selected problems at the back of the book. The entire text has been carefully and extensively edited to increase the clarity of the presentation and to correct minor errors. The reader needs only basic physics and calculus, but a few mathematical topics are included in sufficient detail to bring the reader up to speed with differential equations and determinants. This book is an ideal tool for self-teaching.