Discussion
Why does an infrared spectrometer's sample compartment need purging?
Answer: A
Both gases absorb in the mid infrared and both vary with the room, so their bands appear and change between the background and the sample scans. Dust, oxidation and detector damage are secondary. Purging with dry nitrogen removes the variability rather than merely the absorption, which is the point: a constant background divides out, and it is the change between scans that cannot be corrected.
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