This is a complete guide to the infrared absorption spectra of 90 molecular fragments which have been derived from the vibrational analysis of organic compounds. The means by which these spectra are obtained from the vibrational analysis is demonstrated with examples. The set of normal vibrations and the infrared absorption regions of each of the fragments are discussed, followed by tables showing the absorption regions of each of the fragments in particular surroundings. These tables are based on interpretations of spectra published in the research literature up to 1993. Each table is...