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Attenuated Total Reflectance Basics | ATR-FTIR Spectroscopy

Attenuated Total Reflectance (ATR) is one of the most used sampling technologies for FTIR Spectroscopy. The reason for the ubiquitous use of ATR is that it enables solids and liquid samples to be analyzed neat - simplifying the measurement of virtually all substances. In contrast with transmission, the other widely used sampling method, the measurement pathlength is independent on the thickness of the sample. #ATR is an internal reflection-based method, and the sample pathlength is dependent on the depth of penetration of the infrared energy into the sample. A solid sample can be 100 microns thick or 100 mm thick and the recorded infrared spectrum will basically look the same. If a fluid or slurry sample is in contact with the ATR surface, the infrared spectrum of the liquid portion is recorded. It is this latter phenomena that makes ATR so powerful for chemical reaction monitoring. Learn More about ATR: https://www.mt.com/us/en/home/product... #shorts #mettlertoledo #spectroscopy #chemistry #fouriertransform #science #ftir