The main difference between KBr and ATR in FTIR analysis is the method used to analyze the samples.
In KBr FTIR analysis, the samples are mixed with KBr powder as a matrix or holder. This technique is mainly used for powder analysis. By changing the sample concentration or adding extra sample and KBr to the pellet die, the pathlength of the sample can be increased, allowing for control over the peak intensities. KBr pellets offer advantages in identifying weak bands and improving limits of detection. No peak intensity correction is required in KBr FTIR analysis.
On the other hand, ATR (Attenuated Total Reflection) FTIR analysis is used for surface analysis without the need for any extra materials or holder. In this method, the sample is pressed against a high-refractive-index prism, and the infrared spectrum is measured using infrared light that is totally internally reflected in the prism. ATR is an excellent method for obtaining infrared information from the surface of powder samples directly.
In summary, KBr FTIR analysis requires the use of KBr powder as a matrix and allows for control over peak intensities by changing the sample concentration or adding extra sample. ATR FTIR analysis, on the other hand, does not require any extra materials and allows for direct measurement of the infrared spectrum from the surface of powder samples.
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