Attenuated Total Reflectance (ATR) is a sampling technique used in infrared spectroscopy that allows for the analysis of samples without the need for extensive preparation. It works by directing infrared light into a crystal at a specific angle, causing some of the light to reflect and penetrate the sample in contact with the crystal surface. This method is particularly useful for analyzing solids, liquids, and pastes, making it a versatile technique in IR instrumentation.
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