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 C₉H₈ (spiro[4.4]nona-1,3,6,8-tetraene)

Property		Experiment	Calculated	Comparison
Energies Entropies	Enthalpy 298.15K
	Enthalpy 0K
	Energy 0K		305
	Energy 298.15K		274
	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		303
	HOMO-LUMO Energies		286
	Barriers to Internal Rotation		0
Geometries	Cartesians		287
	Internal Coordinates		286
	Products of moments of inertia		275
	Rotational Constants		282
	Point Group		307
Vibrations	Vibrational Frequencies		278
	Vibrational Intensities		281
	Zero-point energies		278
	Vibrational scaling factors
	Anharmonic frequencies and constants
	Raman frequencies and intensities		4
Electronic States	Electronic states	x	0
Electrostatics	Atom charges		198
	Dipole		35
	Quadrupole		227
	Polarizability		231
Other results	Spin		0
	Number of basis functions		25
	Conformations		1