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 C₄H₆O₂ (γ–Butyrolactone)

Property		Experiment	Calculated	Comparison
Energies Entropies	Enthalpy 298.15K	x
	Enthalpy 0K
	Energy 0K		489
	Energy 298.15K		10
	Atomization Enthalpy 298.15K	x	0	x
	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		488
	HOMO-LUMO Energies		477
	Barriers to Internal Rotation		0
Geometries	Cartesians		483
	Internal Coordinates		483
	Products of moments of inertia		481
	Rotational Constants		488
	Point Group		489
Vibrations	Vibrational Frequencies		478
	Vibrational Intensities		640
	Zero-point energies		478
	Vibrational scaling factors
	Anharmonic frequencies and constants
	Raman frequencies and intensities		32
Electronic States	Electronic states	x	0
Electrostatics	Atom charges		310
	Dipole		433
	Quadrupole		353
	Polarizability		369
Other results	Spin		0
	Number of basis functions		34
	Conformations		1