Abstract

Infrared ir spectroscopy is one of the most important analytical techniques available to scientists. One of the great advantages of ir spectroscopy is that virtually any sample may be studied in any state. Liquids, solutions, pastes, powders, films, fibers, gases, and surfaces all can be examined with a judicious choice of sampling technique. The basic theory of ir spectroscopy is described, including the vibrations of molecules that are crucial to the interpretation of ir spectra. Fourier transform (ft) spectrometers are described as these are the most widely used instruments. The sampling procedure used in ir spectroscopy depends very much on the type of sample to be examined. The various sampling techniques commonly available are outlined. Spectrum interpretation is also discussed outlining how information may be gained from an ir spectrum. Infrared spectroscopy is now used in a wide variety of scientific fields and some of the applications of the technique are summarized: organic and inorganic molecules, polymers, biological and industrial applications are reviewed.