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 NH₃NH₃ (Ammonia Dimer)

Property		Experiment	Calculated	Comparison
Energies Entropies	Enthalpy 298.15K	x
	Enthalpy 0K
	Energy 0K		885
	Energy 298.15K		602
	Atomization Enthalpy 298.15K		19
	Atomization Enthalpy 0K		19
	Entropy (298.15K)	x	7	x
	Entropy at any temperature		7
	Integrated Heat Capacity		7
	Heat Capacity (Cp)		7
	Nuclear Repulsion Energy		854
	HOMO-LUMO Energies		733
	Barriers to Internal Rotation		0
Geometries	Cartesians		799
	Internal Coordinates		799
	Products of moments of inertia	x	782	x
	Rotational Constants	x	795	x
	Point Group		862
Vibrations	Vibrational Frequencies	fun.	791	x
	Vibrational Intensities		875
	Zero-point energies		791
	Vibrational scaling factors
	Anharmonic frequencies and constants
	Raman frequencies and intensities		2
Electronic States	Electronic states	x	0
Electrostatics	Atom charges		516
	Dipole	x	669	x
	Quadrupole		585
	Polarizability		617
Other results	Spin		0
	Number of basis functions		58
	Conformations		2	x