Formaldehyde, CH2O (C2v)

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C-H symmetric stretching
(a1)
C-H asymmetric stretching
(b2)
C-O stretching
(a1)
3121 cm-1
(IR intensity = 0.0052)
(Raman active)
3085 cm-1
(IR intensity = 0.092)
(Raman active)
2053 cm-1
(IR intensity = 1.0)
(Raman active)
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H-C-H in-plane scissoring
(a1)
H-C-H in-plane rocking
(b2)
H-C-H out-of-plane wagging
(b1)
1444 cm-1
(IR intensity = 0.041)
(Raman active)
1176 cm-1
(IR intensity = 0.27)
(Raman active)
1165 cm-1
(IR intensity = 0.028)
(Raman active)