Surface Ionization and Thermoelectronic Property of Uranium Dioxide

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概要

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• The ionic species emitted from uranium dioxide on the tungsten and rhenium filaments by the surface ionization have been identified as UO2<SUP>+</SUP>, UO<SUP>+</SUP> and U<SUP>+</SUP>. The ion of UO3<SUP>+</SUP> could not be observed in any conditions. By measuring the ionic currents of <SUP>238</SUP>U<SUP>16</SUP>O2<SUP>+</SUP> and <SUP>238</SUP>U<SUP>16</SUP>O<SUP>+</SUP> the values of the heats of vaporization of UO2<SUP>+</SUP> and UO<SUP>+</SUP> have been estimated. The value of UO2<SUP>+</SUP> changes at about 2230 °K for the tungsten filament and 2080 °K for the rhenium, respectively, and the values for the higher temperature range are larger than those for the lower range, irrespective of the filament materials. The thermoelectronic properties of uranium dioxide have been studied. The work function of the filament covered with the uranium dioxide changes at the specific temperature similarly to the ionic emission of UO2<SUP>+</SUP>. From the experimental data of the ionic emissions of UO2 and UO, and those of the thermoelectronic emissions, the heats of vaporization of uranium dioxide and monoxide molecules from uranium dioxide on the tungsten and rhenium filaments have also been calculated.

• 日本質量分析学会の論文

著者

• KUBO KENJI

  Engineering Research Institute, Kyoto University

• Sasaki Noriaki

  Engineering Research Institute, Kyoto University

• ASANO MITSURU

  Engineering Research Institute, Kyoto University

• MAGARI SABURO

  Engineering Research Institute, Kyoto University

関連論文

• Mass Spectrometric Studies of the Work Function and the Heats of Sublimation of Atom and Positive Ion
• Surface Ionization and Thermoelectronic Property of Uranium Dioxide
• Vaporization of Strontium Atom and Ion from Strontium Oxide Applied on Tungsten and Rhenium
• Heats of Vaporization of UO2 and UO from UO2

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