NSRDS-NBS.

approximately arising from errors Atomic Energy Levels Basic Standards Bureau of Standards calculations Center for Radiation cents Chem cm-¹ Co/R Cp/R cross coupling degrees of freedom dimensionless units E. K. Plyler energy levels enthalpy entropy evaluation and compilation functions for ammonia G₂ Gv₁₂ harmonic oscillator HARRISON AND KOBE heat capacity Ideal Gas Institute for Basic inversion JANAF Joules Khim linear linear interpolation materials research molecular data Molecular Vibrational Frequencies molecule National Bureau National Standard Reference nearly harmonic NSRDS NSRDS-NBS Office of Standard out-of-plane vibration partition function Phys Properties of Ammonia pyramid Qv₂ Reference Data Series Reference Data System rigid rotator rotational constants Standard Reference Data symmetric and antisymmetric symmetric top Tables of Molecular technical Technology term in eq term-by-term sum Thermodynamic functions Thermodynamic Properties uncertainty v2 mode vibrational anharmonicity vibrational coupling constants vibrational energies vibrational modes vibrational quantum numbers W. S. Benedict wavenumber