the Fourier transform infrared spectroscopy (FTIR)

Abstract

Fourier transform infrared spectroscopy (FTIR) is a largely used technique to identify the functional groups in the materials (gas, liquid, and solid) by using the beam of infrared radiations. Functional groups can be associated with characteristic infrared absorption bands, which corre-spond to the fundamental vibrations of the functional groups. A normal mode of vibration is infra-red active (i.e., it absorbs the incident infrared light) if there is a change in the dipole moment of the molecule during the course of the vibration. Thus, symmetric vibrations are usually not detected in infrared.