Discussion
Why can a non-dispersive infrared analyser not measure oxygen or nitrogen?
Answer: B
A vibration only absorbs infrared if it changes the dipole moment, and a molecule of two identical atoms has no dipole to change, so oxygen, nitrogen, hydrogen and chlorine are transparent. Their absorption is absent rather than merely inconveniently placed, and they are chemically harmless to the optics. This is precisely why oxygen has to be measured by some other principle altogether, most often its paramagnetism or an electrochemical or zirconia cell.
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