Fourier transform infrared spectroscopy12/29/2023 Types of bending vibrations include deformation, rocking, wagging and twisting. There are two different types of stretching vibrations: symmetrical and asymmetrical. With H2O as an example molecule, there exist three fundamental vibrations which are comprised of two stretching vibrations and one bending vibration, as seen in Figure 2. The number of fundamental vibrations in a molecule consisting of N atoms can be calculated as 3N-6 for non-linear molecules, or 3N-5 in linear molecules. The exact frequency that is required for this interaction depends on numerous factors: the type of vibration, such as stretching or bending the strength of the bonds, such as single, double or triple bonds the atoms and isotopes involved the symmetry of the molecule and the chemical environment.Ĭonsequently, every infrared active molecule has an unique infrared fingerprint however, not all vibrations can absorb mid-infrared radiation. ![]() This article focuses on mid-infrared radiation, which can be absorbed by the sample upon interaction with molecular vibrations. This region can be further separated into near (0.78-3 µm), mid (3-30 µm), and far (30-300 µm) infrared. In the case of infrared spectroscopy the radiation is in the infrared region of the electromagnetic spectrum, as seen in Figure 1, with wavelengths between 0.78 and 300 µm. Spectroscopic methods are based on the interaction of radiation with matter.
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