Techniques of traditional IR transmission sampling of solids, powders, and liquids have been displaced in many cases by ATR. The switch to ATR is often driven by convenience because ATR simplifies sampling by requiring no sample preparation. Nevertheless, there are applications that greatly benefit from using the “old school” techniques of transmission. Since it is quite possible there is a growing generation of IR users who have never made a KBr pellet or a polymer film for IR transmission analysis, I would like to take this opportunity present a how-to overview.
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