Discussion
Why can a glass cell not be used for infrared work?
Answer: D
Silicate glass absorbs heavily across the mid infrared, so cells are made from sodium chloride, potassium bromide or similar salts, which are transparent. Scattering and reactivity are not the issue, and thin glass is easy to make. The consequence is that infrared cells dissolve in water and must be handled dry, which shapes the whole practice of sample preparation in a way no other spectroscopy demands. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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