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The Fourier Transform Infrared Spectroscopy (FT-IR)

FT-IR spectroscopy (FT-IR) is a well-known and proven technology for analysis and identification of unknown chemicals. The method is based on a microscopic interaction between infrared light and a chemical substance by a process of absorption and results in a set of ranges, called the spectrum (the spectrum is unique for chemical substance and serves as a "molecular fingerprint"). Despite the fact that FT-IR - is widely applicable method, it uses the analysis of the chemical substances’ intrinsic properties, thanks to that FT-IR is very suitable for comparison with the spectral library. With the use of an extensive database, the comparison with the spectral library makes it possible to quickly identify thousands of chemicals on the base of their unique "molecular fingerprint".

Besides the absorption is the characteristic of the individual groups of atoms, its intensity is directly proportional to their concentration. Thus, by measuring the absorption intensity after a simple calculation provides the amount of this component in the sample.

In their capability method is almost universal. FTIR spectroscopy is used for determining the content of organic and inorganic substances and compounds in solid, liquid and gaseous samples (foods, soil, metals and their alloys, polymers, etc.).


The absorption spectrum of the polyethylene glycol, filmed by FT-IR spectrometer Nicolet 8700

Reviews and methods


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FT-IR spectrometer Nicolet 8700



The Leading Researcher in optical systems Alexandr Shimko

Specialist in spectroscopy and granulometry Anastasia Povolotckaia



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