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	A₁	2217		webbook
7	B₂	3142		webbook				different numbering

Bond Type	Count
H-C	4
C=C	1

Atom 1	Atom 2
H1	C2
H1	C3
C2	C3
C2	H4
C3	H5

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	¹A₁	C2V bridging H	True							C_2v	1	2
1	2	¹A₁	C2V HCCH2	False							C_2v	1	2

State	Config	State description	Conf description	Exp. min.	Quadrupole (D Å)			Reference	comment	Point Group	Components
State	Config	State description	Conf description	Exp. min.	xx	yy	zz	Reference	comment	Point Group	dipole	quadrupole
1	1	¹A₁	C2V bridging H	True						C_2v	1	2
1	2	¹A₁	C2V HCCH2	False						C_2v	1	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 C2H3- (vinyl anion)

Experimental data for C₂H₃^- (vinyl anion)