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Fourier-transform infrared spectroscopy
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<p>Fourier transform infrared spectroscopy (FTIR) is a technique used to obtain an <a href="/facts/Infrared/44XdJNcc">infrared</a> <a href="/facts/Electromagnetic_spectrum/24LARvFY">spectrum</a> of <a href="/facts/Absorption_(electromagnetic_radiation)/xBYKt7yS">absorption</a> or <a href="/facts/Emission_(electromagnetic_radiation)/fxumR717">emission</a> of a solid, liquid, or gas. An FTIR spectrometer simultaneously collects high-resolution spectral data over a wide spectral range. This confers a significant advantage over a <a href="/facts/Dispersion_(optics)/cUdHnYXz">dispersive</a> <a href="/facts/Spectrometer/IqRE8xaQ">spectrometer</a>, which measures intensity over a narrow range of <a href="/facts/Wavelength/kcJU0ymz">wavelengths</a> at a time. </p><p>The term <i>Fourier transform <a href="/facts/Infrared_spectroscopy/u1Hzx617">infrared spectroscopy</a></i> originates from the fact that a <a href="/facts/Fourier_transform/XXhKJtc8">Fourier transform</a> (a mathematical process) is required to convert the raw data into the actual spectrum. </p>