Description: Measured and estimated spectroscopic data for thorium, uranium, and plutonium oxide vapor species have been used with the methods of statistical mechanics to calculate thermodynamic functions. Some inconsistencies between spectroscopic data and some thermodynamic data have been resolved by recalculating ..delta..H/sup 0//sub f/ (298.15/sup 0/K) values for the vapor species of these oxides. Evaluation of the uncertainties in data, methods of estimating molecular parameters, and effects of assumptions have been discussed elsewhere. The tables of thermodynamic functions that were reported earlier have been revised principally because the low-frequency vibrational modes of UO/sub 2/ and UO/sub 3/ have now been measured. These new empirical data resulted in changes in the electronic contributions to the calculated thermodynamic functions of UO/sub 2/ and the estimated vibrational contributions for PuO/sub 2/. In addition, some minor changes have been made in the methods of calculation of the electronic contributions for all molecules.
Date: March 1, 1980
Creator: Green, D.W.
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Partner: UNT Libraries Government Documents Department