infrared spectroscopy (inˑ·fr
·redˈ spek·tr
sˑ·k·pē),
·redˈ spek·trsˑ·k·pē),n an instrumental technique used to identify substances—in particular the functional groups present in organic compounds by measuring their absorption of infrared radiation over a range of frequencies. The absorption pattern is then compared to the infrared spectra of known substances for identification.
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