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Confidence votes 228. Infrared spectroscopy, or IR spectroscopy, is a method of spectroscopy used by organic chemists to help determine the structure of an unknown molecule. An IR spectrum will have peaks based on how much light was visible when shone through different parts of the molecule.
Spectroscopy is the analysis of the interaction between matter and any portion of the electromagnetic spectrum. Traditionally, spectroscopy involved the visible spectrum of light, but x-ray, gamma, and UV spectroscopy also are valuable analytical techniques. Spectroscopy may involve any interaction between light and matter, including absorption, emission, scattering, etc. Introduction to Spectroscopy.