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 H₂CC^- (vinylidene anion)

Property		Experiment	Calculated	Comparison
Energies Entropies	Enthalpy 298.15K	x
	Enthalpy 0K
	Energy 0K		600
	Energy 298.15K		578
	Atomization Enthalpy 298.15K		0
	Atomization Enthalpy 0K		0
	Entropy (298.15K)		0
	Entropy at any temperature		0
	Integrated Heat Capacity		0
	Heat Capacity (Cp)		0
	Nuclear Repulsion Energy		576
	HOMO-LUMO Energies		506
	Barriers to Internal Rotation		0
Geometries	Cartesians		559
	Internal Coordinates		506
	Products of moments of inertia		592
	Rotational Constants		600
	Point Group		602
Vibrations	Vibrational Frequencies	fun.	600	x
	Vibrational Intensities		571
	Zero-point energies		600
	Vibrational scaling factors
	Anharmonic frequencies and constants
	Raman frequencies and intensities		5
Electronic States	Electronic states	x	0
Electrostatics	Atom charges		343
	Dipole		456
	Quadrupole		374
	Polarizability		371
Other results	Spin		601
	Number of basis functions		72
	Conformations		1