ABSTRACT
Infrared (IR) spectroscopy is concerned with the interaction between light and vibrational motion of the covalent chemical bonding of molecules and lattice vibrations of ionic crystals. In a modern Fourier Transform Infrared (FT-IR) system, IR radiation is introduced to a scanning interferometer and the output radiation intensity as a function of time is decoded into frequency and intensity information through a mathematical calculation known as Fourier transformation. Most of the commercially available FT-IR systems employ the so-called single beam optical path design. The Deuterated Tri-Glycine Sulfate (DTGS) pyroelectric detector is a standard detector of the FT-IR spectrometer. The DTGS detector has sensitivity in this region as well and is commonly used. One scans the FT-IR instrument, the scan conditions must be established. The parameters which should be set by the operator are: resolution, combination of detector, source, and beam splitter to match the frequency range, optical path difference velocity, apodization function, and choice of phase correction.
