Discussion
What does attenuated total reflectance measure?
Answer: A
In this technique the beam undergoes total internal reflection inside a crystal, and the evanescent wave that penetrates a micrometre or two beyond the surface is absorbed by whatever is pressed against it. It is neither simple reflection, transmission nor scattering. Because the effective path length is fixed and tiny, samples need no preparation at all - which is why the technique has largely displaced mulls and pellets in routine work. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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