AES and XPS study of plutonium oxidation

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The initial oxidation of plutonium metal at 27/sup 0/C has been studied using AES and XPS. Initially a clean plutonium surface was prepared by Ar/sup +/ bombardment and 500/sup 0/C-Ar/sup +/ bombardment heat cycles. Changes occurring in the plutonium Auger electron spectra in the energy range of 40 to 120 eV and the 4f/sub 5/2/, 4f/sub 7/2/ (core levels), and 5f, 7s (valence band) XPS peaks were monitored during oxygen exposure (10 to 1.8 x 10/sup 8/ L). Examination of the 4f/sub 7/2/ level revealed two oxidation states which are attributed to a suboxide and PuO/sub 2/. The 4f/sub 7/2/ ... continued below

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Pages: 17

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Larson, D.T. January 1, 1979.

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The initial oxidation of plutonium metal at 27/sup 0/C has been studied using AES and XPS. Initially a clean plutonium surface was prepared by Ar/sup +/ bombardment and 500/sup 0/C-Ar/sup +/ bombardment heat cycles. Changes occurring in the plutonium Auger electron spectra in the energy range of 40 to 120 eV and the 4f/sub 5/2/, 4f/sub 7/2/ (core levels), and 5f, 7s (valence band) XPS peaks were monitored during oxygen exposure (10 to 1.8 x 10/sup 8/ L). Examination of the 4f/sub 7/2/ level revealed two oxidation states which are attributed to a suboxide and PuO/sub 2/. The 4f/sub 7/2/ binding energies for the two oxidation states and plutonium metal are 426.1, 424.4, and 422.2 eV, respectively. By taking the Auger ratio (0(511 eV)/Pu(317 eV)), it was observed that oxidation proceeded by two steps. In the first step there was a rapid increase of oxygen with the formation of the suboxide. In the second stage, the 0(511 eV)/Pu(317 eV) ratio was constant with conversion of the suboxide to PuO/sub 2/.

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Pages: 17

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Dep. NTIS, PC A02/MF A01.

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  • 26. national vacuum symposium, New York, NY, USA, 2 Oct 1979

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  • Report No.: RFP-2939
  • Report No.: CONF-791013-11
  • Grant Number: EY-76-C-04-3533
  • Office of Scientific & Technical Information Report Number: 5673906
  • Archival Resource Key: ark:/67531/metadc1092233

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1979

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • March 20, 2018, 5:45 p.m.

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Larson, D.T. AES and XPS study of plutonium oxidation, article, January 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1092233/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.