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 C₂^- (carbon diatomic anion)

Property		Experiment	Calculated	Comparison
Energies Entropies	Enthalpy 298.15K	x
	Enthalpy 0K
	Energy 0K		91
	Energy 298.15K		78
	Atomization Enthalpy 298.15K		0
	Atomization Enthalpy 0K		0
	Entropy (298.15K)	x	5	x
	Entropy at any temperature		5
	Integrated Heat Capacity		5
	Heat Capacity (Cp)		5
	Nuclear Repulsion Energy		76
	HOMO-LUMO Energies		79
	Barriers to Internal Rotation		0
Geometries	Cartesians	x	84
	Internal Coordinates	x	64	x
	Products of moments of inertia	x	74	x
	Rotational Constants	x	77	x
	Point Group		80
Vibrations	Vibrational Frequencies	fun. har.	78	x
	Vibrational Intensities		271
	Zero-point energies	x	78	x
	Vibrational scaling factors	x
	Anharmonic frequencies and constants
	Raman frequencies and intensities		5
Electronic States	Electronic states	x	0
Electrostatics	Atom charges		41
	Dipole		62
	Quadrupole		57
	Polarizability		215
Other results	Spin		63
	Number of basis functions		127
	Conformations		1