This important book describes the basic principles of astrochemistryan interdisciplinary field combining astronomy, physics, and chemistrywith particular emphasis on its physical and chemical background. Chemical processes in diffuse clouds, dense quiescent molecular clouds, star-forming regions, and protoplanetary disks are discussed. A brief introduction to molecular spectroscopy and observational techniques is also presented. These contents provide astronomers with a comprehensive understanding of how interstellar matter is evolved and brought into stars and planets, which is ultimately related to the origin of the solar system. The subject matter will also be understandable and useful for physical chemists who are interested in exotic chemical processes occurring in extreme physical conditions. The book is a valuable resource for all researchers beginning at the graduate level.

Introduction.- Derivation of Molecular Abundances.- Basic Concepts for Gas-Phase Chemical Reactions.- Chemistry of Diffuse Clouds.- Chemistry of Molecular Clouds I: Gas-Phase Processes.- Chemistry of Molecular Clouds II: Gas-Grain Processes.- Chemistry of Star-Forming Regions.- Chemistry of Protoplanetary Disks.- Chemical Evolution from Interstellar Clouds to Star- and Planet-Forming Regions.- Appendix 1: Rotational Spectra of Molecules.- Appendix 2: Observational Techniques.- Solution to Problems.