Next, the beam is modified to contain a different combination of frequencies, giving a second data point. Rather than shining a monochromatic beam of light at the sample, this technique shines a beam containing many frequencies of light at once, and measures how much of that beam is absorbed by the sample. (This is how some YV-Vis spectrometers work, for example.)įourier transform spectroscopy is a less intuitive way to obtain the same information. The most straightforward way to do this, the "dispersive spectroscopy" technique, is to shine a monochromatic light beam at a sample, measure how much of the light is absorbed, and repeat for each different wavelength. The goal of any absorption spectroscopy (FTIR, ultraviolet-visible ("UV-Vis") spectroscopy, etc.) is to measure how well a sample absorbs light at each wavelength. The term Fourier transform infrared spectroscopy originates from the fact that a Fourier transform (a mathematical process) is required to convert the raw data into the actual spectrum. This confers a significant advantage over a dispersive spectrometer which measures intensity over a narrow range of wavelengths at a time. An FTIR spectrometer simultaneously collects high spectral resolution data over a wide spectral range. Fourier transform infrared spectroscopy can detest whether jadeite jade has been impregnated with polymer resin.įourier transform infrared spectroscopy (FTIR ) i s a technique which is used to obtain an infrared spectrum of absorption or emission of a solid, liquid or gas.
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