FTIR Spectroscopy: Attenuated Total Reflectance (ATR)

IntroductionMid-Infrared (IR) spectroscopy is an extremely reliable and well recognized fingerprintingmethod. Many substances can be characterized, identified andalso of the strengths of IR spec-troscopy is its ability as an ana-lytical technique to obtain spectrafrom a very wide range of solids,liquids and gases. However, inmany cases some form of samplepreparation is required in order to obtain a good quality IR spectrometershave been used to analyze solids,liquids and gases by means oftransmitting the infrared radia-tion directly through the the sample is in a liquid or solid form the intensity of thespectral features is determined bythe thickness of the sample andtypically this sample thicknessFT-IR SpectroscopyAttenuated Total Reflectance (ATR)TECHNICAL NOTEF aster samplingImproving sample-to-samplereproducibilityMinimizin g user-to-user spectralvariationHigher quality spectral databases for more precise material verificationand identificationKey FeaturesTECHNICAL NOTEFT-IR in contactwith evanescent waveTo DetectorAT RCrystalInfraredBeamcannot be more than a few tens ofmicrons.

crystal and is passed to the detector in the IR spectrometer. The system then generates an infrared spectrum. For the technique to be successful, the following two requirements must be met: • The sample must be in direct contact with the ATR crystal, because the evanescent wave or bubble only extends beyond the crystal 0.5 µ - 5 µ.

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