Transcription of FTIR Spectroscopy: Attenuated Total Reflectance (ATR)
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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.
(ZnSe) and Germanium are by far the most common used for HATR sampling. Zinc Selenide is a rela-tively low cost ATR crystal material and is ideal for analyzing liquids and non-abrasive pastes and gels but it is not particularly robust with a working pH range of 5-9. ZnSe scratches quite easily and so care must be taken when cleaning the crystal ...
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