zinc selenide, diamond, germanium) are needed for the ATR technique. ![]() IRE crystals with a high refractive index (RI) of 2.4 or higher at 1000cm-1 (e.g. For many ATR measurements the IR light interacts with the sample at a 45 degrees incident angle to the crystal/sample interface. The IRE crystal surface is in contact with a liquid or solid sample species to be measured and as the IR light passes through the IRE crystal it interacts at the crystal/sample interface. What are the differences between using ATR spectroscopy and transmission spectroscopy for analysis and which option is better? Read this article to find out.ĪTR | Attenuated Reflectance Spectroscopyįor the ATR technique, IR radiation passes through an Internal Reflection Element (IRE) crystal material. ![]() Transmission vs ATR spectroscopy | Animated Guides
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