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State	Conformation	minimum conformation	conformer description	state description
1	1	yes	D*H	¹Σ_g
1	2	no	C2V	¹A₁

	hartrees
Energy at 0K	-113.943707
Energy at 298.15K
HF Energy	-113.395176
Nuclear repulsion energy	36.784738

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)
1	Σ_g	1213	1171
2	Σ_u	2115	2042
3	Π_u	90	87
3	Π_u	90	87

Atom	x (Å)	y (Å)	z (Å)
C1	0.000	0.000	0.000
C2	0.000	0.000	1.294
C3	0.000	0.000	-1.294

	C1	C2	C3
C1		1.2944	1.2944
C2	1.2944		2.5888
C3	1.2944	2.5888

All results from a given calculation for C₃ (carbon trimer)

using model chemistry: CCSD(T)=FULL/cc-pVQZ

States and conformations

Conformer 1 (D*H)

Conformer 2 (C2V)

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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	C1	C2	C3
C1		1.2943	1.2943
C2	1.2943		2.5885
C3	1.2943	2.5885

All results from a given calculation for C3 (carbon trimer)

using model chemistry: CCSD(T)=FULL/cc-pVQZ

States and conformations

Conformer 1 (D*H)

Conformer 2 (C2V)

All results from a given calculation for C₃ (carbon trimer)