The two types of Vibrational Spectroscopy differ in the mechanisms they rely on:
Dipole moment – Vibrations which have large changes of dipole moments give rise to ❌;
Polarisability – Vibrations which cause large changes in polarisability give rise to ❌.
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Strong IR, Weak Raman
Strong IR, Weak Raman
Strong Raman; Weak IR
Strong Raman; Weak IR
