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	hartrees
Energy at 0K	-76.381071
Energy at 298.15K	-76.379501
HF Energy	-76.149973
Nuclear repulsion energy	19.997118

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	Σ	3493	3327	43.31
2	Σ	2078	1979	4.75
3	Π	413	393	7.03
3	Π	413	393	7.03

Atom	x (Å)	y (Å)	z (Å)
C1	0.000	0.000	-0.480
C2	0.000	0.000	0.738
H3	0.000	0.000	-1.549

	C1	C2	H3
C1		1.2181	1.0692
C2	1.2181		2.2873
H3	1.0692	2.2873

All results from a given calculation for C₂H (Ethynyl radical)

using model chemistry: QCISD/6-31G*

States and conformations

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for C2H (Ethynyl radical)

using model chemistry: QCISD/6-31G*

States and conformations

All results from a given calculation for C₂H (Ethynyl radical)