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Infrared (IR) spectroscopy is a vibrational spectroscopy based on photon-matter interaction. The energy absorption by a molecule induces in particular vibrations (stretchings noted ν and bendings noted δ).

Move the red atoms to simulate a stretching
Move the red atoms to simulate a bending

It allows for the identification of certain chemical functions of a compound. It is possible to perform quantitative analysis in infrared and thus to quantify a compound in a mixture. With few sample preparation steps, this technique is well suited for the analysis of solid, liquid or gaseous samples.

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