Excellent for thick or strongly absorbing samples-ideal for difficult samples like black rubberĪ DRIFTS accessory operates by directing the IR energy into a sample cup filled with a mixture of the sample and an IR transparent matrix (such as KBr).Analysis of samples in their natural states-no need to heat, press into pellets, or grind to collect spectra.Fast and easy cleanup-simply remove the sample and clean the surface of the crystal.Minimal sample preparation-place the sample on the crystal and collect data.In addition, ATR is often the preferred method for liquid analysis because it simply requires a drop of liquid to be placed on the crystal. Even irregular-shaped, hard solids can be analyzed using a hard ATR crystal material such as diamond. Other solids that are a good fit for ATR include homogeneous solid samples, the surface layer of a multi-layered solid or the coating on a solid. ATR works well for these samples because the intensity of the evanescent waves decays exponentially with distance from the surface of the ATR crystal, making the technique generally insensitive to sample thickness. What types of samples can you analyze with ATR?ĪTR is ideal for strongly absorbing or thick samples which often produce intense peaks when measured by transmission. The detector records the attenuated IR beam as an interferogram signal, which can then be used to generate an IR spectrum. The attenuated beam returns to the crystal, then exits the opposite end of the crystal and is directed to the detector in the IR spectrometer. In regions of the IR spectrum where the sample absorbs energy, the evanescent wave will be attenuated.
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