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State	Conformation	minimum conformation	conformer description	state description
1	1	no	C*V	²Σ
1	2	yes	CS	²A^'

	hartrees
Energy at 0K	-11.680530
Energy at 298.15K
HF Energy	-11.680186
Nuclear repulsion energy	9.697794

Atom	x (Å)	y (Å)	z (Å)
C1	0.000	0.000	-0.485
C2	0.000	0.000	0.744
H3	0.000	0.000	-1.555

	C1	C2	H3
C1		1.2296	1.0696
C2	1.2296		2.2992
H3	1.0696	2.2992

	hartrees
Energy at 0K	-11.680186
Energy at 298.15K	-11.678497
HF Energy	-11.680186
Nuclear repulsion energy	9.697794

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

using model chemistry: B3LYP/CEP-121G

States and conformations

Conformer 1 (C*V)

Conformer 2 (CS)

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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Calc. vs exp. Bad Vib. HF vs MP2 Bad scale factors Low excited states Oddities NaCN Is not linear FAQ Help Units Choose Units Energy Bond length Rotational Constant Moment of Inertia Dipole and Quadrupole Polarizability Explanations Hartree cm-1 Debye Credits Just show me Show me a calculated geometry Summary Using older interface Limit Basis sets Method options List Recent molecules Choose a few Molecules Number of atoms By heavy atoms Diatomics InChI Deuterated Dimers Geometry Point group Point group count Bonds types Isodesmic reactions Bad point group Multiple conformers, states Vibrations Big anharmonicity Energy Enthalpy at 0 Kelvin Similar molecules Similar Isomers Cis/trans Tautomers Multiple conformers, states Ions, Dipoles, etc. List Ions Ionization changes point group Dipole Quadrupole Polarizability Proton Affinities Index of CCCBDB Feedback Error form Wants
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Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A'	3248	3165	50.58
2	A'	1946	1896	5.99
3	A'	423	412	26.10

	C1	C2	H3
C1		1.2373	1.0884
C2	1.2373		2.3257
H3	1.0884	2.3257

Number	Element	Mulliken
1	C	0.010
2	C	-0.260
3	H	0.250

	x	y	z	Total
	0.004	0.824	0.000	0.824
CHELPG
AIM
ESP

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

using model chemistry: B3LYP/CEP-121G

States and conformations

Conformer 1 (C*V)

Conformer 2 (CS)

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