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	hartrees
Energy at 0K	-151.623083
Energy at 298.15K
HF Energy	-151.166446
Nuclear repulsion energy	62.241459

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)
1	Σ_g	2290	2290
2	Σ_g	1304	1304
3	Σ_u	3697	3697
4	Π_g	469	469
4	Π_g	469	469
5	Π_u	204	204
5	Π_u	204	204

Atom	x (Å)	y (Å)	z (Å)
C1	0.000	0.000	0.655
C2	0.000	0.000	-0.655
C3	0.000	0.000	1.991
C4	0.000	0.000	-1.991

	C1	C2	C3	C4
C1		1.3100	1.3358	2.6458
C2	1.3100		2.6458	1.3358
C3	1.3358	2.6458		3.9817
C4	2.6458	1.3358	3.9817

Number	Element	Mulliken
1	C	0.062
2	C	0.062
3	C	-0.062
4	C	-0.062

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

using model chemistry: ROMP2/cc-pVDZ

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>	68.721
(<r²>)^1/2	8.290

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

using model chemistry: ROMP2/cc-pVDZ

States and conformations

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