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	Σ	1832		webbook				different numbering
3	Π	550		webbook				different numbering

Bond Type	Count
C#C	1
H-C	1

Atom 1	Atom 2
C1	C2
C1	H3

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	³Π	C_∞v	False							C_∞v	1	1
1	2	¹A^'	C_s	True							C_s	2	3
2	1	¹Σ	C_∞v	True							C_∞v	1	1

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	³Π	C_∞v	False						C_∞v	1	1
1	2	¹A^'	C_s	True						C_s	2	3
2	1	¹Σ	C_∞v	True						C_∞v	1	1

	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 C2H (Ethynyl radical)

Experimental data for C₂H (Ethynyl radical)