Chemistry · Molecular Spectroscopy
For the formaldehyde molecule, H 2 CO, having C 2v symmetry with the character table given below: C 2v E C 2 σ v (xz) σ v (yz) A 1 1 1 1 1 z A 2 1 1 -1 -1 R z B 1 1 -1 1 -1 x, R y B 2 1 -1 -1 1 y, R x The reducible representation Γ 3N (or Γ tot ) is Γ 3N = 4A 1 + A 2 + 4B 1 + 3B 2 . The reducible representation for the vibrational modes alone, namely Γ vib , will be:
- 14A 1 + B 1 + B 2
- 23A 1 + B 1 + 2B 2
- 33A 1 + 2B 1 + B 2✓
- 44A 1 + 2B 2
Correct answer
3A 1 + 2B 1 + B 2
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