Discussion
What is a Nujol mull?
Answer: A
A mull is the solid ground to a fine powder and suspended in a drop of mineral oil, which matches the refractive index well enough to suppress scattering. A pressed disc is the potassium bromide pellet technique, and dissolution and evaporation are other methods. The drawback is that the oil is a hydrocarbon and contributes its own carbon-hydrogen bands, which must be recognised and discounted. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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