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Good Reasons to Use ATR Libraries Transmission spectroscopy was the only method in general use until the early 1960s. The first applications of attenuated total reflection (ATR) or internal reflection spectroscopy were reported independently by Fahrenfort and Harrick. Especially macromolecular materials (rubbers, fibers, fabrics, coatings, laminates etc), which often failed to yield useful transmittance spectra, became accessible for infrared spectroscopic investigations by the ATR technique. Meanwhile, the ATR technique has been proven to be an extremely useful technique for material analysis and has become more widely used for all but gaseous samples....