IR spectroscopy deals with the interaction between a component and radiation in the infrared region (4000-400 cm-1), which is light with longer wavelengths and lower frequency than visible light. For solid sample pellet press technique is commonly used in infrared spectroscopy; it is prepared in a hydraulic pellet press containing potassium bromide (KBr) and sample (1:100 ratio). Liquid samples are analyzed by rectangular cells of KBr or NaCl, but both solid and liquid techniques have some limitations. Hence, Attenuated total reflectance (ATR) is the most commonly used sampling methods in Fourier transform infrared spectroscopy (FTIR). Since, it is time-saving, simple to use and gives a spectrum without the need for sample preparation.
Diamond ATR is one of the most commonly used technique to determine the functional groups of the sample components since its robustness make it appropriate for a broad range of applications. It is best for analysis of solids, liquids, gels, and pastes (either soft or hard material) and diamond ATR is not affected by the pH, color, and temperature of the sample. Diamond is chemically inert, very strong, high resistance to scratches and its complete insolubility making it a perfect crystal material for general measurements over a wide range of samples.
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