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	hartrees
Energy at 0K	-151.614527
Energy at 298.15K
HF Energy	-151.154680
Nuclear repulsion energy	62.841987

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)
1	Σ_g	2194	2194
2	Σ_g	1082	1082
3	Σ_u	3081	3081
4	Π_g	391	391
4	Π_g	391	391
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		1.2981	1.3232	2.6213
C2	1.2981		2.6213	1.3232
C3	1.3232	2.6213		3.9445
C4	2.6213	1.3232	3.9445

Number	Element	Mulliken
1	C	-0.081
2	C	-0.081
3	C	0.081
4	C	0.081

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

using model chemistry: ROMP2/6-31G*

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>	67.370
(<r²>)^1/2	8.208

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

using model chemistry: ROMP2/6-31G*

States and conformations

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