Measurement and applications of absolute infrared intensities

A review of vibrational intensities, both the experimental measurement and the applications, is presented. Starting with the pioneering work of Wilson and Crawford, the paper discusses the advance in the field over the last 50 years. Different experimental techniques of measuring the absolute infrared intensities and the physiochemical properties that can be determined from the vibrational intensities are discussed. Recent use of computational techniques to enhance the experimental measurements is presented as well as recent studies are all discussed to illustrate the current state of vibrational intensities.