Thermodynamic Properties of the Fluorine Atom and Molecule and of Hydrogen Fluoride to 5000°K

The evaluation of the thermodynamic functions Cp0, S0, —(F0—E00)/T, and (H0—E00)/T of the fluorine atom and molecule and of hydrogen fluoride from 100°K to 5000°K have been made by statistical calculations from available spectral constants for the atom and for hydrogen fluoride; for fluorine the constants have been derived or estimated from the Raman shift in gaseous fluorine, the equilibrium internuclear distance from electron diffraction measurements, and the heat of dissociation obtained recently by R. N. Doescher at this Laboratory. These results have been combined with the thermodynamic functions of hydrogen to evaluate the heats and free energies of dissociation and dissociation constants for the equilibria F2⇌2F, HF⇌½H2+½F2, and HF⇌H+F.