What causes weak Raman scattering in centrosymmetric crystals?

💡 Explanation

Raman scattering is weak in centrosymmetric crystals because the inversion symmetry dictates that if a vibrational mode is Raman active, it is not IR active, and vice-versa. This is due to the induced dipole moments canceling each other out; therefore, the overall Raman scattering intensity is reduced, rather than having strong Raman signals.

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