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	hartrees
Energy at 0K	-151.663092
Energy at 298.15K
HF Energy	-151.184572
Nuclear repulsion energy	62.841784

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)
1	Σ_g	2234	2234
2	Σ_g	1190	1190
3	Σ_u	3445	3445
4	Π_g	379	379
4	Π_g	379	379
5	Π_u	199	199
5	Π_u	199	199

Atom	x (Å)	y (Å)	z (Å)
C1	0.000	0.000	0.649
C2	0.000	0.000	-0.649
C3	0.000	0.000	1.972
C4	0.000	0.000	-1.972

	C1	C2	C3	C4
C1		1.2977	1.3235	2.6212
C2	1.2977		2.6212	1.3235
C3	1.3235	2.6212		3.9447
C4	2.6212	1.3235	3.9447

Number	Element	Mulliken
1	C	0.023
2	C	0.023
3	C	-0.023
4	C	-0.023

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

using model chemistry: ROMP2/6-311G*

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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<r²>	67.721
(<r²>)^1/2	8.229

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

using model chemistry: ROMP2/6-311G*

States and conformations

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