NO2F : Nitryl fluoride Collection of spectroscopic data: vibrational frequencies, rotational constants, electronic energies, and enthalpies of formation. Calculation of thermodynamic properties as a function of temperature under thermal equilibrium and non-equilibrium conditions: heat capacity at constant pressure (Cp), enthalpy (h), entropy (s), Gibbs free energy (g), internal partition function (Zint), and translational partition function (Ztr).