Discussion
A vibration absorbs infrared radiation only if it changes the molecule's ______ moment.
Answer: D
The requirement is a changing dipole moment, so that the oscillating electric field has something to couple to. Magnetic moments matter in magnetic resonance, quadrupole moments in specialised nuclear techniques, and angular momentum in rotational selection rules. One sentence accounts for why symmetric molecules are transparent, why carbon dioxide shows only two of its four modes, and why Raman is complementary.
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