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	hartrees
Energy at 0K	-151.617452
Energy at 298.15K	-151.613743
HF Energy	-151.214289
Nuclear repulsion energy	63.543013

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	Σ_g	2223	2223	0.00
2	Σ_g	970	970	0.00
3	Σ_u	1641	1641	313.59
4	Π_g	373	373	0.00
4	Π_g	373	373	0.00
5	Π_u	195	195	17.22
5	Π_u	195	195	17.22

Atom	x (Å)	y (Å)	z (Å)
C1	0.000	0.000	0.643
C2	0.000	0.000	-0.643
C3	0.000	0.000	1.950
C4	0.000	0.000	-1.950

	C1	C2	C3	C4
C1		1.2852	1.3075	2.5927
C2	1.2852		2.5927	1.3075
C3	1.3075	2.5927		3.9002
C4	2.5927	1.3075	3.9002

All results from a given calculation for C₄ (Carbon tetramer)

using model chemistry: CISD/6-311G**

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 C4 (Carbon tetramer)

using model chemistry: CISD/6-311G**

States and conformations

All results from a given calculation for C₄ (Carbon tetramer)