The resulting signal at the detector is a spectrum representing a molecular ‘fingerprint’ of the sample. When IR radiation is passed through a sample, some radiation is absorbed by the sample and some passes through (is transmitted). Journal of Physical and Chemical Reference Data. FTIR stands for Fourier transform infrared, the preferred method of infrared spectroscopy. "Vibrational and Electronic Energy Levels of Polyatomic Transient Molecules. Infrared spectra: It is important to remember that the absence of an absorption band can often provide more information about the structure of a compound.
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