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The infrared region of the electromagnetic spectrum extends from 14,000 cm-1 to 10 cm-1. The region of most interest for chemical analysis is the mid-infrared region (4,000 cm-1 to 400 cm-1) which corresponds to changes in vibrational energies within molecules. The far infrared region (400 cm-1 to 10 cm-1) is useful for molecules containing heavy atoms such as inorganic compounds but requires rather specialised experimental techniques.
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