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	hartrees
Energy at 0K	-262.250046
Energy at 298.15K	-262.249043
HF Energy	-261.806999
Nuclear repulsion energy	122.089559

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	Σ_g	2283	2149	0.00
2	Σ_g	806	758	0.00
3	Σ_u	2455	2311	3244.73
4	Σ_u	1660	1562	139.37
5	Π_g	656	617	0.00
5	Π_g	656	617	0.00
6	Π_u	753	709	130.95
6	Π_u	753	709	130.95
7	Π_u	93	88	0.26
7	Π_u	93	88	0.26

Atom	x (Å)	y (Å)	z (Å)
C1	0.000	0.000	0.000
C2	0.000	0.000	1.267
C3	0.000	0.000	-1.267
O4	0.000	0.000	2.445
O5	0.000	0.000	-2.445

	C1	C2	C3	O4	O5
C1		1.2667	1.2667	2.4452	2.4452
C2	1.2667		2.5333	1.1786	3.7119
C3	1.2667	2.5333		3.7119	1.1786
O4	2.4452	1.1786	3.7119		4.8905
O5	2.4452	3.7119	1.1786	4.8905

atom1	atom2	atom3	angle		atom1	atom2	atom3	angle
C1	C2	O4	180.000		C1	C3	O5	180.000
C2	C1	C3	180.000

All results from a given calculation for C₃O₂ (Carbon suboxide)

using model chemistry: CISD/3-21G

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 C3O2 (Carbon suboxide)

using model chemistry: CISD/3-21G

States and conformations

All results from a given calculation for C₃O₂ (Carbon suboxide)