Discussion
Why is band intensity a poor guide to quantity in a mull or pellet?
Answer: D
Neither a mull nor a pellet has a defined thickness or a known sample concentration within it, so the Beer-Lambert law has no path length to work with. Bands do not shift, detectors are linear, and scattering is suppressed by the matching medium. Quantitative infrared work therefore uses solution cells of known path length or attenuated total reflectance with a fixed effective path, which is the practical consequence of this limitation.
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