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 cation)

Property		Experiment	Calculated	Comparison
Energies Entropies	Enthalpy 298.15K
	Enthalpy 0K
	Energy 0K		761
	Energy 298.15K		729
	Atomization Enthalpy 298.15K		0
	Atomization Enthalpy 0K		0
	Entropy (298.15K)		203
	Entropy at any temperature		203
	Integrated Heat Capacity		203
	Heat Capacity (Cp)		203
	Nuclear Repulsion Energy		750
	HOMO-LUMO Energies		718
	Barriers to Internal Rotation		0
Geometries	Cartesians		741
	Internal Coordinates		739
	Products of moments of inertia		723
	Rotational Constants		740
	Point Group		758
Vibrations	Vibrational Frequencies		740
	Vibrational Intensities		878
	Zero-point energies		740
	Vibrational scaling factors
	Anharmonic frequencies and constants
	Raman frequencies and intensities		10
Electronic States	Electronic states	x	262
Electrostatics	Atom charges		438
	Dipole		513
	Quadrupole		452
	Polarizability		470
Other results	Spin		754
	Number of basis functions		127
	Conformations		1