Vibrational Modes of cis-1,2-Dichloroethylene


C-H symmetric stretching (a₁)	C-H asymmetric stretching (b₂)	C-C stretching (a₁)
3163 cm^-1 (IR intensity = 0.60) (Raman active)	3149 cm^-1 (IR intensity = 1.0) (Raman active)	1806 cm^-1 (IR intensity = 0.44) (Raman active)

Cl-C-H bending (b₂)	Cl-C-H bending (a₁)	H-C-C-H out-of-plane twisting (a₂)
1264 cm^-1 (IR intensity = 0.44) (Raman active)	1188 cm^-1 (IR intensity = 3.2 x 10^-5) (Raman active)	920 cm^-1 (IR inactive) (Raman active)

C-Cl asymmetric stretching (b₂)	H-C-C-H out-of-plane wagging (b₁)	C-Cl symmetric stretching (a₁)
915 cm^-1 (IR intensity = 0.84) (Raman active)	802 cm^-1 (IR intensity = 0.72) (Raman active)	799 cm^-1 (IR intensity = 0.58) (Raman active)

C-C-Cl bending (b₂)	Cl-C-C-Cl out-of-plane twisting (a₂)	Cl-C-C-Cl in-plane scissoring (a₁)
590 cm^-1 (IR intensity = 0.040) (Raman active)	374 cm^-1 (IR inactive) (Raman active)	163 cm^-1 (IR intensity = 0.0024) (Raman active)

cis-1,2-Dichloroethylene, C2H2Cl2 (C2v)