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Spectrophotometers that operate in the infrared spectrum (usually in a wavelength range from 750 to 25,000 nm). These instruments generally use special cuvettes (made of NaCl or KBr) for the far infrared region. Infrared spectrophotometers have fewer biomedical applications than ultraviolet and visible light spectrophotometers and are generally used to determine whether specific functional groups are present or absent and also to identify compounds by comparing their spectra with those in a library of pure compounds.
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