CCCBDB listing of experimental data page 2

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Mode Number	Symmetry	Frequency			Intensity			Comment	Description
Mode Number	Symmetry	Fundamental(cm^-1)	Harmonic(cm^-1)	Reference	(km mol^-1)	unc.	Reference	Comment	Description
2	A_g	1488		webbook
3	A_g	1259		webbook
4	A_u	84		webbook
7	B_3u	901		webbook
8	B_2g	1103		webbook
10	B_2u	813		webbook
11	B_1u	2979		webbook
12	B_1u	1412		webbook

Bond Type	Count
C=C	1
H-C	4

Atom 1	Atom 2
C1	C2
C1	H3
C1	H4
C2	H5
C2	H6

Energy (cm^-1)	Degeneracy	reference	description
0	1		²B_3u
15660	1	webbook

State	Config	State description	Conf description	Exp. min.	Dipole (Debye)				Reference	comment	Point Group	Components
State	Config	State description	Conf description	Exp. min.	x	y	z	total	Reference	comment	Point Group	dipole	quadrupole
1	1	²B_3u	D_2h	False							D_2h	0	2
1	2	²B₃	D₂	True							D₂	0	2

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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Experimental data for C2H4 (Ethylene)

Experimental data for C₂H₄ (Ethylene)