Infrared Spectroscopy

Name:
Infrared Spectroscopy
Detailed information:
An analytical technique that may measure either (1) the range of wavelengths in the infrared that are absorbed by a specimen, which characterize its molecular constitution (absorption spectroscopy), or (2) the infrared waves emitted by excited atoms or molecules (emission spectroscopy). Extremely hot bodies (stars) emit spectra in which the atomic composition can be determined by characteristic lines such as the sodium D line in the sun's spectrum. Infrared absorption bands identify molecular components and structures, some of which are:
Absorption Band (µ)	Structure Indicated
2.3–3.2	OH and NH groups; H2
3.2–3.3	aromatics, olefins
3.33–3.55	aliphatics
5.7–6.1	aldehydes, ketones, acids, amides
See Microwave Spectroscopy; Absorption.