The author's successful first edition introduces basic principles of interpreting infrared spectral data, teaching its readers to make sense of the data coming from an infrared spectrometer. Contents include spectra and diagnostic bands for the more common functional groups as well as chapters on polyester spectra and interpretation aids. This book serves both novices and experienced practitioners in this field. This edition is thoroughly updated with each chapter being revised along with 100 new pages presenting up-to-date applications and interpretation.