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 C₃ (carbon trimer)

Property		Experiment	Calculated	Comparison
Energies Entropies	Enthalpy 298.15K	x
	Enthalpy 0K
	Energy 0K		1269
	Energy 298.15K		129
	Atomization Enthalpy 298.15K	x	64	x
	Atomization Enthalpy 0K		64
	Entropy (298.15K)	x	25	x
	Entropy at any temperature		25
	Integrated Heat Capacity	x	25	x
	Heat Capacity (Cp)	x	25	x
	Nuclear Repulsion Energy		1222
	HOMO-LUMO Energies		1047
	Barriers to Internal Rotation		0
Geometries	Cartesians	x	1207
	Internal Coordinates	x	1207	x
	Products of moments of inertia	x	1208	x
	Rotational Constants	x	1220	x
	Point Group		1224
Vibrations	Vibrational Frequencies	fun.	1220	x
	Vibrational Intensities		1851
	Zero-point energies	x	1220	x
	Vibrational scaling factors	x
	Anharmonic frequencies and constants
	Raman frequencies and intensities		61
Electronic States	Electronic states	x	0
Electrostatics	Atom charges		700
	Dipole	x	917	x
	Quadrupole		783
	Polarizability		786
Other results	Spin		0
	Number of basis functions		97
	Conformations		2	x