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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	-113.750384
Energy at 298.15K
HF Energy	-113.362428
Nuclear repulsion energy	36.622076

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	Σ_g	1203	1136	0.00
2	Σ_u	2166	2045	417.79
3	Π_u	224	212	26.41
3	Π_u	224	212	26.41

Atom	x (Å)	y (Å)	z (Å)
C1	0.000	0.000	0.000
C2	0.000	0.000	1.300
C3	0.000	0.000	-1.300

	C1	C2	C3
C1		1.3005	1.3005
C2	1.3005		2.6009
C3	1.3005	2.6009

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

using model chemistry: MP2/6-31G(2df,p)

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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Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	Σ_g	1203	1137	0.00
2	Σ_u	2166	2046	417.97
3	Π_u	223	211	26.43
3	Π_u	223	211	26.43

	C1	C2	C3
C1		1.3004	1.3004
C2	1.3004		2.6007
C3	1.3004	2.6007

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

using model chemistry: MP2/6-31G(2df,p)

States and conformations

Conformer 1 (D*H)

Conformer 2 (C2V)

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