Q75 · CSIR NET Chemistry, June 2012
Paper: CSIR NET June 2012 · Subject: Physical Chemistry · Chapter: Molecular Spectroscopy · Topic: Raman · Marks: 2 · Difficulty: Medium
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).
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