Thermodynamic Properties of Oxygen Fluoride and Chlorine Fluoride from Spectroscopic Data

Abstract

Spectroscopic and electron diffraction data have been combined to make calculations of the free energy, entropy, and heat capacity of OF2 to the rigid rotator-harmonic oscillator approximation between 298.16° and 1500°K. The spectrum of ClF is known well enough to calculate these properties to the next approximation from 298.16° to 2000°K. Thermal data have been combined with these results to give the complete thermodynamic properties of these two fluorine compounds. It is pointed out that the accepted dissociation energy of F2 is too high, and calculations show that it must be close to 1.5 ev per molecule.