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 C₄H₂O₃ (Maleic Anhydride)

Property		Experiment	Calculated	Comparison
Energies Entropies	Enthalpy 298.15K
	Enthalpy 0K
	Energy 0K		207
	Energy 298.15K		163
	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)	x	0	x
	Nuclear Repulsion Energy		205
	HOMO-LUMO Energies		202
	Barriers to Internal Rotation		0
Geometries	Cartesians	x	202
	Internal Coordinates	x	201	x
	Products of moments of inertia	x	162	x
	Rotational Constants	x	169	x
	Point Group		208
Vibrations	Vibrational Frequencies	fun.	197	x
	Vibrational Intensities		200
	Zero-point energies	x	197	x
	Vibrational scaling factors	x
	Anharmonic frequencies and constants
	Raman frequencies and intensities		5
Electronic States	Electronic states	x	0
Electrostatics	Atom charges		149
	Dipole	x	152	x
	Quadrupole		147
	Polarizability		184
Other results	Spin		0
	Number of basis functions		26
	Conformations		1