For the vibrational Raman spectrum of a homonuclear diatomic molecule, the selection rule under harmonic approximation is
(a)$\Delta \mathrm{v}=0$ only
(b)$\Delta v= \pm 1$ only
(c)$\Delta v= \pm 2$ only
(d)$\Delta \mathrm{v}=0, \pm 1$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Vibrational Raman under the harmonic approximation obeys Δv = ±1 (the polarisability must change during the vibration, which it does for every homonuclear diatomic).