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ATR (attenuated total reflectance)

An FTIR sampling mode in which the sample is pressed against a diamond or ZnSe crystal and the evanescent wave probes the surface. No pellet, no mull, no preparation. The default sampling mode in modern forensic FTIR.

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Related terms

ASTM E2937Backscattered electron (BSE) imagingBeer-Lambert lawElectron impact (EI) ionisationENFSI EPG protocolFingerprint regionFTIR microspectroscopyInternal standard (IS)IRUG databaseLikelihood ratio reportingLimit of detection (LOD) and quantitation (LOQ)Microtome cross-section

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