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Why are #NaCl# plates used instead of quartz plates in IR spectroscopy to load sample?

Answer 1

Because glass (i.e. quartz) would absorb in the IR spectrum, and mask the absorption of your sample.

#NaCl# absorptions are transparent to most of the #IR# spectrum; there are absorbtions at #400-600cm^(-1)#, which leaves most of the spectrum transparent.

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Answer 2

Sarah Angotti

NaCl plates are preferred over quartz plates in IR spectroscopy for sample loading because NaCl is transparent in the infrared region, allowing the analysis of a broader range of frequencies. Quartz absorbs infrared radiation, limiting its applicability in certain spectral regions.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.