Discussion
Why is infrared spectroscopy described as non-destructive?
Answer: A
Vibrational excitation relaxes back to the ground state within picoseconds and leaves the molecule exactly as it was, so a mull or a pellet can be recovered and used again. Moving parts, absorption and dilution are not the point - the photons certainly are absorbed. That a technique returns the sample intact matters greatly when material is scarce or precious, which is why it is often run before anything destructive.
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