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Characteristic Vibrations of NH₃ (C_3v symmetry)

The normal modes for NH₃ were generated by calculations at the MP2 level with the 6-311++G** basis set. The listed frequencies were calculated by Benedict & Plyler (1957, Can. J. Phys. 15:1235-1241), based on spectroscopic measurements. The ammonia molecule has been rotated slightly for ν₃, because the vibration looks better from that point of view.

ν₁ = 3505.7 cm^-1A₁Symmetry	ν₂ = 1022.0 cm^-1A₁Symmetry

ν₃ = 3573.1 cm^-1E Symmetry	ν₄ = 1689.7 cm^-1E Symmetry

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Characteristic Vibrations of NH3 (C3v symmetry)

ν1 = 3505.7 cm-1 A1 Symmetry

ν2 = 1022.0 cm-1 A1 Symmetry

ν3 = 3573.1 cm-1 E Symmetry

ν4 = 1689.7 cm-1 E Symmetry

Characteristic Vibrations of NH₃ (C_3v symmetry)

ν₁ = 3505.7 cm^-1A₁Symmetry

ν₂ = 1022.0 cm^-1A₁Symmetry

ν₃ = 3573.1 cm^-1E Symmetry

ν₄ = 1689.7 cm^-1E Symmetry