Discussion
Why is an infrared spectrum sometimes plotted as transmittance rather than absorbance?
Answer: B
It is a convention: infrared spectra are traditionally shown as per cent transmittance, so bands dip towards the baseline rather than rising from it. Transmittance is not proportional to concentration, which is why quantitative work converts to absorbance. Absorbance is computable for any sample with a known path, and the detector measures intensity either way. An inherited convention that differs from the neighbouring technique's is worth noting explicitly when two spectra are compared.
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