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	hartrees
Energy at 0K	-151.755722
Energy at 298.15K
HF Energy	-151.203386
Nuclear repulsion energy	63.064042

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)
1	Σ_g	2362	2362
2	Σ_g	1428	1428
3	Σ_u	3976	3976
4	Π_g	438	438
4	Π_g	438	438
5	Π_u	196	196
5	Π_u	196	196

Atom	x (Å)	y (Å)	z (Å)
C1	0.000	0.000	0.647
C2	0.000	0.000	-0.647
C3	0.000	0.000	1.965
C4	0.000	0.000	-1.965

	C1	C2	C3	C4
C1		1.2948	1.3178	2.6126
C2	1.2948		2.6126	1.3178
C3	1.3178	2.6126		3.9304
C4	2.6126	1.3178	3.9304

Number	Element	Mulliken
1	C	0.863
2	C	0.863
3	C	-0.863
4	C	-0.863

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

using model chemistry: ROMP2/daug-cc-pVTZ

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>	67.489
(<r²>)^1/2	8.215

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

using model chemistry: ROMP2/daug-cc-pVTZ

States and conformations

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