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	hartrees
Energy at 0K	-75.900983
Energy at 298.15K	-75.899565
HF Energy	-75.731885
Nuclear repulsion energy	19.892665

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	Σ	3437	3331	39.21
2	Σ	2017	1955	3.92
3	Π	499	484	22.65
3	Π	499	484	22.65

Atom	x (Å)	y (Å)	z (Å)
C1	0.000	0.000	-0.484
C2	0.000	0.000	0.742
H3	0.000	0.000	-1.552

	C1	C2	H3
C1		1.2262	1.0680
C2	1.2262		2.2942
H3	1.0680	2.2942

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

using model chemistry: QCISD/3-21G

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/3-21G

States and conformations

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