The ionization and dissociation energies of the different uranium and plutonium oxides have been measured
by mass spectrometry of molecular beams produced by Knudsen effusion at high temperature. The values
obtained constitute a set of self-consistent quantities, which are in agreement with the existing thermodynamic
data of these oxides. On the basis of the experimental molecular parameters, general formulas for the ionization
and dissociation/ionization cross sections due to electron inelastic scattering have been obtained for collision
energies up to about 60 eV. These formulas are sufficiently accurate to calculate the composition of equilibrium
vapor mixtures over UO2 and PuO2 from conventional mass spectrometric measurements.
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