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 data (experiment and calculated) in the CCCBDB for C₃O₂ (Carbon suboxide)

Property		Experiment	Calculated	Comparison
Energies Entropies	Enthalpy 298.15K	x
	Enthalpy 0K	x
	Energy 0K		713
	Energy 298.15K		507
	Atomization Enthalpy 298.15K	x	65	x
	Atomization Enthalpy 0K	x	68	x
	Entropy (298.15K)	x	50	x
	Entropy at any temperature		50
	Integrated Heat Capacity	x	50	x
	Heat Capacity (Cp)	x	50	x
	Nuclear Repulsion Energy		684
	HOMO-LUMO Energies		601
	Barriers to Internal Rotation		0
Geometries	Cartesians	x	665
	Internal Coordinates	x	665	x
	Products of moments of inertia	x	664	x
	Rotational Constants	x	672	x
	Point Group		689
Vibrations	Vibrational Frequencies	fun.	666	x
	Vibrational Intensities		764
	Zero-point energies	x	666	x
	Vibrational scaling factors	x
	Anharmonic frequencies and constants
	Raman frequencies and intensities		414
Electronic States	Electronic states	x	0
Electrostatics	Atom charges		402
	Dipole	x	546	x
	Quadrupole		454
	Polarizability		456
Other results	Spin		0
	Number of basis functions		64
	Conformations		2	x